The Ultimate heroes Female Ben 10 harem X Male reader

Should i make a evil Y/n [edit]

I've been brainstorming this idea for a while I was going to make this Y/n just pure evil he travels around the Multiverse killing other versions of himself and he doesn't care what he has to do he just wants to be the only Y/n in existence even if he has to wipe out everything else to make that possible

I was going to like make the evil Clockwork guy don't remember his name but I'll figure that out so basically this evil Clockwork tells him that there are endless versions of him and he's not special and that would give him a reason to wipe out his other versions and once he's finished with that he's going to rule over all of the dimensions I don't know I haven't come up with a concept yet I'm still brainstorming this let's just say this version of Y/n would work with anyone as long as it benefits him but as soon as he thinks they're no longer useful he'll just basically kill them.

What do you guys think should I do it or should I not and what should I call him if I do it and also

What kind of watch should I give him and how strong should I make him and what will be his name cuz I can't just call him Y/n.