These days, transmigration through cosplay is so common it's getting old. That's what Qingtong said while complaining about her little sister's novel. So fate made him transmigrate as his own original character instead. His original character became real, and since he liked tragic, beautiful characters, he had made his original character a tragic beauty.
Qingtong: Don't ask. I just regret it. If only I'd known, I'd have given myself the invincible hero's character setting. Damn it. (Big brother gets the all-strength, feel-good male lead script.) Lanzhi: Strength is such a wonderful thing. Now I can do whatever I want. So where should I go have fun next? (Little sister gets the all-around, feel-good female lead script.) Chen: Why do I have to go to school even after transmigrating? Still, I get to ship my favorite couple up close, so that's nice.
(Three people transmigrate together as their original characters. There's also a cyberpunk version of Teyvat. The other two have no couples. The main couple is Jing Yuan, and the secondary couples are Blade and Dan Heng, Yingxing and Feng, and Liu Heng. These are all switch pairings, with no set roles. I'm not very good at writing romance, so there may be very little of it, or even none at all. But I ship these pairings myself, so consider this a warning. The relationships between the other Honkai: Star Rail characters follow the original.)
As for power levels, don't ask. The main point is to do whatever feels right.
Theme: Fate is a joyous thing.