So the idea of a JoJo RPG was thrown around in one of my tabletop circles, using some sort of superhero GURPS or something, and I went ahead and just made a Stand and a character for the possible party and setting, which seems to be a group of Speedwagon agents in WWI.

So the character's name is Eddie M., a lanky, sort of skeevy, English agent trained to handle other Stand-users.
His actual Stand is The Trooper, after the Iron Maiden song. The Trooper itself isn't super special, with a D or C in every stat save for Durability and Precision, which both have A's. His power comes from his mirror: if one's reflection is caught in the mirror, from any distance, then any damage one does to the Stand or his user is automatically reciprocated to anyone whose reflection is currently in the mirror.
This also enables The Trooper and Eddie to go into kind of a berserk mode, in which they attack recklessly with headbutts, grapples, and slams, dealing damage to their opponent, which is then compounded by the damage they do to themselves.
The idea is that it's highly improbable to beat The Trooper on your own, that you'd need to either have Jotaru levels of toughness, or fight him with a partner who can help split the pain. Also, it requires a reflection for his Stand to do its ability, so he also can't really fight vampires.

Babble babble babble babble