Suggested by Destroyer Baby Bop is a pretty well known character. I’m not exactly sure how well liked she is, but I’m sure she has fans. That being said, Baby Bop isn’t really much of a fighter so there’s nothing she can do against Mercury. Mercury has her water and ice abilities at the ready and Bop has no real defenses against those. She will quickly be overwhelmed by such an offensive onslaught. Sailor Mercury wins.