>>101566560>>101566025Combining and spinning off from these two theories.
Karmi has super successful parents who put a lot of pressure to her. She also has a twin sister with whom she's competitive because she straight up appears to succeed more in her own fields. Karmi's twin sister shows up as a Supervillain in the show trying to get the attention of Hiro. Hiro notices, but thinks its Karmi because they look the same and the disguise isn't all that disguising, much like Hiro's own costume. He tries to confront Karmi about trying to do supervillain work because he knows she has a crush on the Hero Hiro, and shenanigans ensue, ironic because of the events in the first episode where Karmi couldn't recognize the Hero Hiro as Hiro.