Nigh-Omnipotence characters like Cosmic Armor Superman, Lucifer Morningstar, Oblivion, etc. Yeah, but I'm questioning why some users here have a mindset of "Mimicking someone's superpowers = Automatic win" or something like that.
That's what make TM so dangerous it's not just the abilities and skills it's because you can mimic experiences and there mindset completely and memories
Total Mimicry in media is often displayed as.. mimic superpowers whatever you see (Looking at you Medaka Kurokami and Protege.), but I've never actually seen a character who can use Total Mimicry to not just copy superpowers but copy transformations, memories, etc.
I hate to be the guy, when having a conversation with buddy here a week or two ago. But think about how experienced the mimicry user is, do you think he might have the intelligence to think of the best parts to mimic?