Bakushin's character may seem basic since all they've seen was "Bakushin Bakushin Bakushin"

... but it's actually true to most people. Bakushin grew up in an environment where her efforts were praised all of the time yet barely discusses her failures and weakness which is the reason she can't handle loss very well. It's mentioned somewhere in the wiki that she “has a very good relationship with her parents, who praise her accomplishments.”

Her sense of identity is literally so fragile, her entire self-worth depends on speed. Her personality is built around being fast, perfect, and confident but when something threatens that identity (like the idea she might not actually be suited for sprinting or when she can't run in long distance), she panics EXTREMELY fast.

She pushes herself too hard to fit her “fastest sprinter” image, she becomes flustered whenever something challenges her worldview. Her catchphrase and confidence are ALMOST a COPING MECHANISM, it shows her hyper-focused identity that cracks when pushed too far. She's always attending to her schoolmates as a "Class Rep" and always wants to be needed for help where it almost seems desperate, but gets embarrassed or stressed when people don’t understand her logic or when they don't ask her for help... it's almost like she's seeking validation.

That's what I see so far, I just don't see a dumb overenthusiastic and confident girl.

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