Jack random thoughts

Explanation in general of Jack
Jack comes from a Story I had before, but I never bothered to start or even end it, I do have some plot points I had before, Ki being one of them. I was working on him in at the time the FG theme happened and when I had a rough model I decided to add him to the fighting/fantasy theme.
"How he got Ki"
Jack would make a ritual to Summon Ki, Ki is a spirit, and these spirits would be dodgy in existence, they could be the manifestation of the will of the world, Dead souls imbued with elements, or part of your soul that broke out, they are technically their own entity, but they could be wildly different personality wise, or be basically you but as a spirit. Ki in particular likes to troll Jack a bit, but he in general tends to be the friend he can kind of talk to because he is in his head, mostly bouncing on and off his own thoughts with Ki. Overall, Ki just wants to help Jack, and he would be his inner voice talking out loud in some situations.
Powers
"Actual functionality of Ki"
Jack was supposed to be the MC so he had a weird power in general, Ki would amplify, boost or use its own energy as fuel. The best way to describe it would be a multipurpose battery.
Ki basically uses crystals he creates if he doesn't "expel energy" to use as area of influence. Jack would then throw them around magic stuff in their base form/pure energy to harness that type of magic beyond just the body of Jack that works as an extension of Ki.
Jack would be able to use the energy of Ki to harness magic through the orbs, or use it for "natural energy", kinetic energy, Radiation, magnetism, electricity, etc.
"Energy vision"
Jack would be able to also see energy with help of Ki, he is able to swap his view to be akin to a "thermal" looking vision mostly shown as various hues of blue to sky blue to pure white if he looked to something like Ki with said vision.
"What is Ki?"
Ki is a spirit and is Energy, as a concept. It can convert its energy, turn it into fuel to expand said magic, or amplify it. At first, he would learn how to use a gun he found around to make a fireball, throw some crystals around to spawn electric balls, and it would go further to boost himself to power himself, but his body having problems taking in the energy or losing his senses, moving by instinct and risking his life more the more he boosted himself, making it almost a secure death if he charged himself to the max
"Kinetic boosting"
he would also be to make it, so his own strength would be boosted by boosting the kinetic energy on his swings and such.
"Boosting himself/His own body"
Ki can also boost Jacks Body, if you notice, Jack had brown eyes before and now Jack has like a blue greenish color, that is years of Jack having his body charged by Ki, and the way to signal his boost or "Install" be by the way his pupils changed color to a full on light blue color. The more his body gets charged, the more he gets numb to everything around him or his fighting style becomes more reactive/by instinct alongside a shorter life span, With the years he managed to diminish some of the side effects but not all of them. If he gets fully boosted, it becomes a coin toss whether he lives or dies after basically running on a super powered adrenaline injection for 30 minutes to 1 hour, and he knows the risk even if this version never went "full boost" once.
"Random"
the rest of this is just random thoughts of his original story, or random plot points in general. Among other things, it would be: him meeting like 3 other girls and some of his friends that also got Isekaid.
1 gets a foxgirl gf, the other gets a kuudere Elf, and he would be friends with a mage.
every one of them would have a spirit as a way to cast magic, the mage would end up dead, then revived, Jack would become an escort/bodyguard/boyfriend of some princess
Jack would fight a guy that had as title "God of War" pushing himself so much that once he blacked out it was a coin toss if he would be dead or alive.