[@Nomadic] It's not that similar, other than the fact that Quirks can be permanently taken away. It can still work for the RP, though I'd recommend giving some thought to how exactly his Quirk does what it does.

I wouldn't just make it a touch based thing for example, or if you do make it take a while; you probably don't want to accidentally de-power one of our characters by making it too easy for him to steal Quirks. Make it a more involved process, like he needs to force people to ingest his blood or something, or make it a hidden aspect of another Quirk like how Amon could seal bending by a specific application of chi blocking.