SSJ2 - Thea Evanora.

Key: Kazuki Alter
Character: Thea Evanora
Skill(or transformation): SSJ2
How well do you know the source material?(obviously not relevant if it's a transformation): Extreme trauma plowed through the mind which causes a Saiyan to reach a new height pass Super Saiyan.

Reasoning: After hearing that her siblings have achieved the state. Thea wondered when she would ever reach that point. She never saw herself prepared yet to go through such times but she wasn't there at the moment to see how it went down between her siblings. So, she never understood what point in time she would ever achieve such a point.

Moments: As the Life Fiber Senketsu was about to reach around and be worn by Thea. Another Life Fiber being interjected and attacks it with lethal intent and aimed to forcefully rip it shreds after defeating it and permanently kill it where they stood. Thea hadn't worked and researched for long periods of time to this point just for it to be wasted and ruined like this. Even if it meant she had to take another life, she was going to achieve that attire.