(ranked from worst to best)
Buck
Class: Flank
His personality seems to be yelling everything he says, which is very annoying. Primary is a powerful shotgun blast, can fire a net that only slows down enemies. Also has the very exciting abilities to heal half his health over time, and to Jump Very Far. Ultimate reloads your ammo and gives you better rate of fire. Very boring man with a very tiny head.
Best Skin: Triggerman
Worst Skin: Brawler

Viktor
Class: Damage
He's generic army man, but Russian. His primary is a very bog standard assault rifle, while secondary just lets you look down the sights. His third ability is a grenade that behaves like a grenade, but you can hold it before throwing it. His final ability is a run button. His ultimate lets him call down three air strikes anywhere on the map, which have very large areas of effect. Viktor is incredibly boring but he's also a character that a game like this kind of needs, so I'm being lenient towards him.
Best Skin: Full Moon
Worst Skin: Charcoal

Willo
Class: Damage
I hate her, her model is ugly and her voice is annoying. Her primary is a slow shot with a large blast radius that deals stupid damage, her secondary is a weak shot that creates a small area where enemies can't be healed, and her tertiary ability throws out a seed mine that explodes into four more seeds, which then also explode. Her movement ability is just a dash upwards. Her ultimate gives her limited freeflight and makes her shot slightly faster, because apparently unlike some other characters she needs that kind of restriction on freeflight.
Best Skin: Hemlock
Worst Skin: Default

Lian
Class: Damage
Apparently she's royalty so she obviously sucks. Her primary fire is an automatic rifle shot, her secondary fires a single shot that can hit multiple enemies, her tertiary is a piercing shot that needs to charge up for a moment, and her last ability is a dodge in any direction alongside a single shot. Her ultimate is a single powerful shot. She is.... very basic.
Best Skin: Dark Monarch
Worst Skin: High Elf

Cassie
Class: Damage
Doesn't seem to have a personality outside of girl, and her voice is very annoying. She does have a bird, though. Primary is a long range crossbow bolt, secondary is a bolt that deals no damage but launches whoever is hit backwards. She can also fire a bolt that creates an AoE burst. Both of these abilities have an absurd amount of range. She can also dodge roll, and her ultimate lets the whole team see where enemies currently are.
Best Skin: Night Bane
Worst Skin: Tinder

Kinessa
Class: Damage
She's just like, a lady. She's the sniper of the game, her primary is a rapid fire shot, but holding the secondary button puts you in sniper mode. Waiting for a few moments in sniper mode charges it, which makes it do more damage. She can throw down mines that deal passive damage to anyone who goes near them, and she has a fairly ridiculous teleport. Her ultimate reveals weakspots on enemies, and shooting them in sniper mode deals added damage.
Best Skin: Battlesuit Eagle Eye
Worst Skin: Viking

Strix
Class: Damage
He's a very boring hunter man. He's a second sniper, but not just a sniper. When not using the secondary aim ability, his primary sniper rifle cannot aim for shit and fires in completely random directions. Fortunately, you can use the third ability to switch to a much more useful pistol. This also changes the secondary ability to a flare that deals passive damage to whoever it hits, as well as revealing them to your team. He can also enter a stealth mode for a limited time. His ultimate is a flashbang that stuns enemies. He's weird, but in a very mundane way.
Best Skin: Remix
Worst Skin: Infiltrator

Lex
Class: Flank
He's a NARC. He has a weird gimmick where he starts with a bounty on a certain player, and he gets extra money towards the upgrade store when they are killed. His tertiary ability will change who the current bounty is on command, and reveals where the enemy is to you when you're near. His primary is rapid shots from dual magnums, his secondary fires 6 shots at the closest enemy, and his last ability is a slide forward, which you can fire from. His ultimate is a single shot that instantly kills anyone under 65% health, and splashes onto other enemies. His gimmick is interesting but he's overall really not that interesting.
Best Skin: L-Exo Suit
Worst Skin: Longboard

Zhin
Class: Flank
He's a samurai, or at least uses a sword... a sword that is on fire. His primary has him swing his sword, flinging out slashes of fire as projectiles, with every third swing being stronger than the first two. His secondary is a counter in a FPS, so you can tell how useful that is. Her tertiary has him become invisible and move faster for a short time. His last ability is a spinning slash forward. His ultimate has him dash forward, and lock the first opponent he comes in contact with in a series of sword swings, which launches them at the end. I think it's fun they tried to do a Smash Bros. sword character in an FPS, but I don't think it works that well.
Best Skin: Omega
Worst Skin: Forest Stalker

Sha Lin
Class: Damage
I'm not a fan of the honorable warrior archetype, at least not in how it's used with this guy and other badly written things. At least his kit is interesting. His primary is an arrow shot, which has infinite ammo and can be fired rapidly, but you can charge it to increase damage almost tenfold, and increase the range by a lot. His secondary turns his next arrow into one that cripples enemies, preventing them from using movement abilities. It behaves like a basic arrow. His third ability fires five arrows rapidly, and his final launches him backwards before giving him a brief moment of invisibility. His ultimate makes him invisible for a short time, only revealing him when he fires, but instantly cloaking when he finishes.
Best Skin: Crime Fighter
Worst Skin: Burrito Jersey

Talus
Class: Flank
He's a little monkey devil man. His primary is a very fast, but very weak, rapid fire shot, and his tertiary ability can boost that speed and make it so it doesn't need ammo for a short time.. His secondary is a rushing punch that knocks opponents backwards, and his movement ability lets him create a rune that he can teleport to within the next 30 seconds. His ultimate lets him teleport directly to an opponent and deal light damage to them. I don't really get this guy's deal, considering he's very weak and doesn't really seem to fill a specific niche besides "fast damage".
Best Skin: Trick or Treat
Worst Skin: Wukong

Vivian
Class: Damage
She seems to be like, a spy or something. A femme fatale. Her primary is a machine gun that fires very fast and has a lot of ammo, and her secondary just lets her look down the sights. Her third ability creates a shield that covers her front for a few seconds, and her final ability throws down a sensor drone that reveals enemies who wander into its area of effect, and only disappears when destroyed. Her ultimate creates two drones that add additional fire to her primary, and this lasts until she dies. I feel like I get what they're going for with her, but it's not particularly interesting to me.
Best Skin: Omega
Worst Skin: Day Walker

Barik
Class: Front Line
The Engineer but Scottish and the ability to create a shield instead of teleporters. Still has turrets, primary fire is a spreadshot, and has a short movement ability that has way too long of a cooldown. Ultimate is a very strong shield with a turret in the middle.
Best Skin: Team Fortress 2
Worst Skin: Hi-Tek

Jenos
Class: Support
He is a space wizard and acts like a space wizard. His primary fire is an automatic carbine that is frankly ridiculous for a support character, his secondary is a healing blessing that can be applied to allies through walls. His tertiary ability lifts opponents up into the air, leaving them open for a short while but meaning Jenos can't attack, and his last ability is a sprint that lasts until you use your gun again. His ultimate is a powerful beam that goes through walls and other obstacles. He's weirdly powerful for a support character.
Best Skin: Exarch
Worst Skin: Resplendant

Inara
Class: Front Line
She seems to be like, mother earth or something? Her primary fires off three shards of rock at a time, with brief delays between each fire, as well as needing to reload. Her third and fourth abilities both spawn constructs, a large wall for the third ability, and an obelisk for the fourth. The wall blocks damage, and the obelisk deals damage and decreases enemy speed while they're in its AoE. Her secondary grants her rock armor, which lowers the damage she and her constructs take over its duration, while also increasing any healing she is given. Her ultimate has her throw her rock spear forward as a powerful projectile that can pierce through enemies and shields. I like the idea of her kit, but I think it needs more fleshing out.
Best Skin: Iron Madam
Worst Skin: Digitized

Grohk
Class: Support
Wow, this is a very racist character! Whoever decided on this design sucks! But at least his kit is somewhat interesting. Primary is a long range lightning beam that deals rapid hits and gets stronger as it hits one enemy, and his secondary is a lightning ball that bounces between enemies that are close together. He can also create healing totem structures, and can become invisible while also getting rid of status effects on him. His ultimate has him float around while firing lightning bolts at nearby enemies. He's basically a weird offensive support character. Too bad the design is very racist, he would be much lower on this list if he wasn't!.
Best Skin: Neon Demon
Worst Skin: Chieftain

Tyra
Class: Damage
She seems to be a monster hunter, which rules. Her primary is an automatic rifle that just goddamn shred enemies. Her secondary is just a simple grenade launcher, but her tertiary fires a fire bomb that creates a massive AoE pool of fire that deals a TON of damage over time. Her fourth ability marks her opponent, letting her see them through walls and lets her deal extra damage. Her ultimate gives her infinite ammo AND increases her rate of fire, which is amazing. Her kit feels good but it's just a bit too simple. She'd probably be the one I would play the most, though.
Best Skin: Drakefire
Worst Skin: Heartbreaker

Ash
Class: Front Line
She's like, a cool punk lady. Her primary shot fires an exploding ball at fairly slow speeds, and her secondary charges up your next primary shot, turning it into a large blast that can launch multiple opponents back. Her tertiary summons a shield that moves forward, and her movement ability has her performing a shoulder charge. Her ultimate has her slam a banner into the ground, dealing damage to nraby enemies, and making her invulnerable while standing near the banner for as long as it lasts. It's actually pretty unique to have a lady character like this, but she's still a bit kinda bland.
Best Skin: Ronin
Worst Skin: Alien Buster

Skye
Class: Flank
She seems to enjoy killing people a lot. Basically this game's Spy. Primary is close range bolts from a wrist launcher, and her secondary fires 3 poison darts that deal damage over time. She can shoot a smokescreen that can turn her invisible for as lang as she's in it, but her last ability can just make her invisible for a  limited time. They're basically the same thing except one is obvious. Her Ultimate throws a big bomb on the ground that deals more damage than most characters in the game can take.
Best Skin: Pilot Suit
Worst Skin: Chrome

Seris
Class: Support
She's an evil witch lady, which is fun. Her primary is a rapid fire magic ball from her hand. Each hit from this inflicts up to 4 Soul Orb stacks on enemies it hits. Her tertiary ability interacts with that, instantly dealing damage based on how many stacks are on the opponent, and healing Seris. She also has a heal beam, and can turn invisible and invulnerable for a short while. Her ultimate creates a rift ins pace that sucks nearby enemies into it, while stunning them. This lets you inflict some stacks on them, and then deal some major damage, while also keeping opponents passive. Overall she's pretty neat.
Best Skin: Remix
Worst Skin: Madame

Ying
Class: Support
Cute girl who is actually fairly violent. Her primary fires five quick, weak shots from her mirror, damage that totals up when you land all five. Her tertiary can create a fake copy of herself that heals nearby allies, and her secondary causes said illusion to move towards the nearest opponent, where it will then explode and deal damage. Her last ability allows her to swap places with her farthest away copy. Her ultimate makes it so she passive heals allies for a short time, and gives her the ability to teleport to any ally. It's a very unique kit attached to a not that interesting character.
Best Skin: Death Speaker
Worst Skin: Replicant

Drogoz
Class: Damage
He's a dragon with jetpack armor, it's COOL. His primary is a bog standard rocket launcher, but his tertiary ability allows him to load three shots into his rocket launcher, and then fire them in a row the next time primary fire is used. His secondary shoots a fire ball that makes enemies more vulnerable to attacks. His last ability is a rocket jump, except Drogoz can fly for a short time, so you actually just use it to get into the air, and then begin flying. It's like if rocket jumping was taken to its logical extreme. His ultimate takes a while to start up, but it makes Drogoz go flying and instantly kill the first enemy he comes in contact with,
Best Skin: Dreadhunter
Worst Skin: Pyre Warrior

Fernando
Class: Front Line
His personality is being Spanish. Primary is a short range flamethrower with ammo that recharges and also deals a passive burn effect. Secondary is a portable shield that he can hold out for a short time. Tertiary ability is a fireball the can pierce enemies. Ultimates makes it so that allies around him can't lose health once their health reaches a certain threshold. Basically a weird mix of the Pyro and the Heavy.
Best Skin: FN-01 Helios
Worst Skin: Enforcer

Torvald
Class: Front Line
He's the only good elf, because he's an old guy with a big stone arm. His primary is a rapid fire magic blast from his gauntlet that deals little damage, but fires REALLY rapidly. His secondary activates a close range nullifying beam, which prevents enemies hit by it from using abilities while the beam is hitting them. His third ability creates a weak shield around an ally. His final ability gives him a shield that protects himself from up to 2000 damage. His ultimate has his gauntlet fire a massive fuck-off beam that causes knockback. It's a fun mix of different support effects without resorting to healing.
Best Skin: Dark Lord
Worst Skin: Clockwork, by default because its his only other skin.

Evie
Class: Flank
She's kind of just a cute anime girl, which isn't that interesting but, whatever. Her primary fires out a slow blast of ice magic from her staff, which actually deals AoE damage, but is also absurdly powerful. Her secondary covers her in a block of ice that blocks damage but prevents her from moving. She can also teleport short distances, and ride around on her broom like a witch's broom! Her ultimate creates an AoE ice storm that deals damage to anyone inside it. She doesn't have a very clear playstyle, but it's definitely unique and fun.
Best Skin: Troublemaker
Worst Skin: Black Ice

Makoa
Class: Front Line
Makoa is a turtle with a cannon and an anchor, so he's great, but he also feels incredibly unpolished and without a real sense of playstyle. His primary cannon fire is slow but deals good damage. His secondary throws an anchor out that then drags enemies towards him. His tertiary emits a shield around him and other allies that blocks damage. His last ability has him go into his shell and spin forward, knocking back anyone he hits. His ultimate replaces the cannon with a melee anchor attack, and gives him a health buff. Maybe it's just me, but there's conflicting aspects of his kit. He's not crowd control, and he's not particularly great at shielding, and his ultimate is kind of just a downgrade. I dunno.
Best Skin: Omega
Worst Skin: Prosperous

Maeve
Class: Flank
She's a cat burglar! She's cat themed! She's cute! Her primary has her fling two knives out, which deal decent damage, but you only get one before needing to reload. Her secondary is a burst forward that launches her back on hit, and her fourth grants her increased movement speed and jump height for a short time, or until she uses her weapon. Her tertiary ability, however, completely resets the cooldown of her other attacks, and also heals her. It has a 20 second cooldown, however, so you can't use it constantly. Her ultimate limits the vision of nearby enemies, preventing them from seeing outside of a very limited area around them. I don;t think her kit is viable but it's fun.
Best Skin: Raeve
Worst Skin: Dreamhack

Khan
Class: Front Line
I'm a sucker for big armor dudes, I just wish his kit was a bit more interesting. His primary is a heavy repeater that's moderately fast but deals heavy damage. His secondary has him pull out a large shield that he can move around, and regains its health when not in use. His third ability makes him briefly invulnerable as he lets out a yell that heals himself and nearby allies. His final ability is a dash forward, and if he comes in contact with anyone they are grabbed and thrown behind Khan. His ultimate has him grab an enemy, and he can proceed to carry them around for a limited time, or throw them into walls for extra damage. His character is very well communicated through his kit alone I feel, but it's a bit of a generic tank with minor crowd control.
Best Skin: Safecracker
Worst Skin: Draconic Enforcer

Androxus
Class: Flank
What if Reaper was actually cool. His main attack is a basic revolver pistol shot, and his secondary is a melee punch with no cooldown. His third ability lets him absorb projectile shots, and then fire out a blast that deals equivalent damage. His final ability is a dash that can be used in any direction, and up to 3 times in a row before needing to refresh. You can also hold the jump button to float in midair. His ultimate turns his revolver into a DEMON REVOLVER for a short time that deals absurd damage with each shot. I genuinely like this guy's kit, it's simple but unique.
Best Skin: Battlesuit Godslayer
Worst Skin: Exalted (which is a good skin, all his skins are good)

Mal'Damba
Class: Support
This guy's main weapon is a goddamn snake, so. His primary makes his snake fire out poison blobs, but when you need to reload, Mal'Damba instead throws his snake forward as a projectile that stuns enemies. His secondary is a healing beam, which has very little cooldown. His third ability throws a gourd that creates a pool that either heals your allies, or passive damages enemies. His final ability has him slither forward as a spirit, making him immune to damage for a moment. His ultimate summons the visage of a giant snake, making all enemies nearby run away in fear. Very clearly a healer character, but his added damage and stun effect are really cool.
Best Skin: Wickerman
Worst Skin: Chancellor

Grover
Class: Support
Grover is a tree man, so he's automatically good. His primary is a throwing axe that deals more damage the farther it goes. His secondary is like, shooting a wave from his axe, that adds the cripple effect when it hits. He has a healing ability that affects everyone near him, and a grappling vine to make up for his slow speed. His ultimate creates a large healing AoE for a few seconds that heals a lot. Grover is basically the main healer of the game.
Best Skin: Doom Shroom
Worst Skin: Winter

Ruckus
Class: Front Line
Goblin in a mech, goblin in a mech. The goblin is kind of just a normal goblin, but his mech has a very sarcastic onboard computer that seems to hate him, which is good. His primary is minigun fire, which behaves like Heavy's, and his secondary is basically a rocket launcher with a few shots before it has to reload. He can also make a shield around him, and can burst forward while still being able to shoot. His Ultimate makes some bigger guns show up and fire rapidly, but you can't move while this is happening. Basically the Heavy if he had his own overcharge and a rocket launcher.
Best Skin: Pirate's Treasure
Worst Skin: B.E.T.A.

Terminus
Class: Front Line
Terminus is a stone giant, and his character is described perfectly by saying that he's the first melee-focused character in the game. His primary is a very slow but very damaging axe swing. His tertiary ability creates a shield that absorbs enemy fire, and applies up to four Calamity Charges depending on how much you absorb. With these charges, his secondary goes from him shooting one weak energy orb, to four nearly instantaneously. His final ability is a leap and then axe slam. Finally, his ultimate only works when he dies! It completely revives him, and then creates a massive blast that deals heavy damage. He's really neat.
Best Skin: Omega
Worst Skin: Jotunn

Pip
Class: Support
His personality seems to be being an arrogant little shit, which fits I suppose. His primary fires a potion that flies in an arc, but has very high range. His secondary fires a different potion that flies in the same arc, but creates a larger explosion when it hits. His tertiary is a healing potion that heals whoever it hits, which also flies in an arc. His last ability launches him into the air and makes him jump higher for a short time. Hm. Ultimate is another potion fired in the same arc that transforms whoever it hits into chickens, which have little health. More of a general support character, even if that support isn't healing.
Best Skin: Remix Pepper
Worst Skin: Raider

Moji
Class: Flank
bnuuy. Bunny witch on a two headed dragon! Her primary has her familiar's right head breath out a stream of flame, and her secondary, which is basically a second primary, has the familiar's left head spit out a magic ball. Hitting enemies with the flame will apply a magic mark to them, and the magic ball will cause extra damage based on how charged the mark is. Her tertiary ability is a shield that adds magic marks to whoever hits it, and her movement ability simply has her familiar run forward. Her ultimate has her cast a magic spell that transforms a single opponent into a large dog treat, and approaching them will have the familiar eat it, acting as an insta kill. It's a very fun kit and also bunny
Best Skin: Cuddly
Worst Skin: Dragonborn (by default)

Bomb King
Class: Damage
You know who it is, the best character in the game. Bomb King is basically the Demoman on steroids, with his primary being sticking bombs that can be planted anywhere they're thrown, and they can then be detonated with the secondary ability. His third ability throws out a large grumpy bomb that creates a massive explosion, and his last ability is a bomb that causes knockback to enemies and yourself, acting as an on command bomb jump. His ultimate sends him rolling forward as a massive bomb, which can be detonated at any time during its duration.
Best Skin: Pumpking
Worst Skin: Love Machine