Undyne speaks to the part of me that was obsessed with fighting games. I felt like if I could just get strong enough, then people would have to take me seriously. This fucker can't say I don't exist if I can perfect-KO him, right? But that's not how the world works. And it made me fucking miserable when I lost.
But Undyne is the positive side of all of that. In her strength, she doesn't have to care what people think. She's respected, mostly, not feared. She fights to protect, not to destroy.
A better role model than Marisa Kirisame, anyway. But without a body, you take what you can get, I guess.