Teagan Did Nothing Wrong

People have a tendency to enter these threads wondering why we like Teagan so much, and the typical response is, "the only decent character". That's true enough, but I think we should have a proper biography for an explanation. The game starts with two main characters, Alto Cantabile, and her friend Teagan Almace. Alto comes from a noble family and had a harshly strict (CRAWLING IN MY SKIN) upbringing, unable to interact with anyone outside of her estate. Teagan met her at the edge of the grounds one day and tried to become friends with her. She snuck into the estate multiple times to interact with Alto, and eventually gets caught and kicked out. They up the patrols and tell Teagan that Alto is only allowed to interact with a worthy violinist as a practice partner. Teagan is pissed off at the way they're treating Alto, so she takes up a violin right away and plays it night and day until she is the best damn violinist in the entire city. She dedicated herself to mastering an instrument for the sake of getting close to Alto so she could support her.  Because of Alto's upbringing, she's naive and doesn't know much about operating in the outside world, so Teagan stays by her side to offer support whenever she needs it and act as a voice of reason. They start their journey together to recruit an ensemble to perform the World Tuning and postpone an ice age. So who does Alto get to perform? The first amateurs she meets with the required instruments on the way to the performance site. Every single time, Teagan warns her that they might not be good enough, and Alto ignores her. Every step of the way when Teagan tries to keep everyone on track and talk common sense, she gets shot down. Even in the first half of the game, she's the only character with her head screwed on right. Despite all the bullshit that Teagan has to put up with, even Alto admits that she depends on Teagan for many things. We don't see much of it directly, but it's implied that Teagan has been very helpful to Alto for as long as they've known each other. Finally, after recruiting some amateurs and gathering the sheet music they need, the ensemble goes through three days of rehearsal. They travel to the top of Metronome Tower to perform the World Tuning and save the world...and they fuck it up. The first ensemble to ever fail the World Tuning. They fuck it up so badly that Zeus smites them for their faggotry. Alto and Teagan were the only ones to not make any mistakes. Alto barely makes it back to the town with the ensemble to recover. As they're all sitting in a room, trying to process what happened, Teagan finally reaches her breaking point. She goes full NUCLEAR. She calls out every single one of them, BTFOS and triggers the entire party. She calls out everything the player has already been thinking by this point about the party's incompetence. She tears up part of the sheet music they need, and storms off. Teagan triggers the party so hard that they all split up and Alto has to track them down one at a time. Through a prolonged series of events, Alto gathers everyone but Teagan, and eventually  corners Teagan where they started. Teagan wants nothing to do with Alto's shitty party after they already failed once, and starts to BTFO them again. Inevitably, they fight each other. In the good ending, Alto loses. Teagan apologizes that it's come to this, and fucking guts Alto with her bare hands. This is the one emotionally charged moment that this game actually has. Teagan has been with Alto since they were both a very young age, and she knows that what Alto is trying to do is going to tear her apart. She can't handle the task that's been saddled with her, and her ensemble wasn't good enough to perform the World Tuning properly. She knows that if Alto keeps pitting herself against this impossible task, she'll go through terrible things fruitlessly. Instead, Teagan gives her a swift death. In the canon story where Alto gets Teagan back in the party, it turns out Teagan was absolutely correct. Alto and co. enter the extradimensional plane "Uncommon Time" on a quest to recompose the music they need for the World Tuning. Alto enters a personal mindfuck dungeon and fights some edgy bosses. It's revealed here that Alto harbors a lot of hatred for the world because mommy and daddy didn't treat her the way she wanted while they were training her to save the world, as the only bloodline capable of doing so. Alto meets her suppressed split personality that wants to destroy the world and accelerate the ice age because muh childhood, muh wrists. If Alto's split personality supersedes her, she emerges from the mindfuck dungeon and announces to the party that she's destroying the world instead. One party member that has a crush on her joins her. Two of the others kill themselves. Teagan is left alone, cursing what happened. She knows that if only she was able to kill Alto when she had the chance, this wouldn't be happening. Instead, Alto's true bitchiness prevails, and Teagan's once best friend has become the avatar of the apocalypse. If Alto somehow decides that dooming the entire world because of her personal childhood ISN'T the right thing to do, they eventually get the music recomposed and get ready to try performing it again. Through this ordeal, Teagan's nature hasn't changed, but ever since getting back into Alto's party, Teagan's will has started to erode. She doesn't fight to insert common sense into the party as much since she knows it's no use, and just starts giving up in general. Whenever she tries offering support for Alto, even after everything that's happened, Alto straight-up tells her to fuck off. It's also worth mentioning at this point that besides being the only one in the party to always have the task at hand in mind, Teagan has other qualities that endeared her to us. Teagan is the only party member with primarily physically based attacks. While everyone else is casting spells, Teagan is beating the shit out of monsters with her bare fists. She is also "pure". When everyone else is whoring it up and bragging about how much sex they've had, Teagan has nothing to do with it and actually stays focused on the mission. She's also confirmed to be very physically fit. On the night before the second attempt of the World Tuning, Teagan talks to Alto alone. Teagan pours her soul out to Alto and apologizes for basically being the most amazing friend in the world. Alto's response is that she will NEVER forgive Teagan, and that forgiveness is something that can't be earned. Teagan just gives up. Her will has been thoroughly eroded at this point. I'll skip past two endings since they don't have much to do with Teagan, and just talk about the "best" ending after the two bonus dungeons. Alto and the party go through "Uncommon Time" again and experience the memories of the two founders of the World Tuning, who-aadsjalL;KUASDLI;FK. After they're done with all that bullshit, they finally go to the top of Metronome Tower again and fight the REAL final boss. They perform the World Tuning successfully, and spend one and a half days in a slice of life sequence while Alto is asleep. The last scene of the game is back at the dock where they started, and Alto tells the party that her plan is to "confront" her parents, whatever that means. Teagan agrees to go with Alto and everyone else decides to go with her to "confront" the Cantabile family, which is left to be pretty vague. This is where my thoughts and the sentiments of the others split apart. I think Teagan's decision to go with Alto and confront her family fits what Teagan had been saying from the very start. Teagan has always said that Alto's family is shit, and saw them as the source of Alto's isolation and inexperience. Of course she would take the opportunity to face them if Alto is prepared to do so. Of course, what the others are saying is also valid. Teagan is still going along with Alto's plan. Alto didn't like her childhood, but guess what, she was being trained to save the fucking world, which required intense conditioning. Alto's parents can hardly be blamed for fulfilling their bloodline obligation and doing their part to save the world. When Alto actually meets the people responsible for starting the World Tuning tradition, she fucking idolizes them, so I don't know who she's really mad at any more. This is off-track from Teagan though. The conclusion that most people drew was that Teagan had been completely broken by going through the memories in Uncommon Time, and follows whatever Alto thinks is a good idea; a tragic story of a strong, sharp-minded individual being worn down and defeated. Either that, or Teagan is using this as an excuse to eliminate the entire Cantabile family, and at last Remove Alto.
In conclusion, Teagan is best girl, and did nothing wrong.