God this is such a wide open question since there are so many characters and enemies in video games that can just super kill you.
I think the one that comes to mind is one called Ozma from final fantasy 9, it’s a superboss and it’s…hard. It can very easily just kill your whole party if you aren’t prepared. (Though not being prepared is a good way to die in any final fantasy fight tbh)
Hmm in terms of characters you play as maybe Bayonetta? She’s pretty lethal.
I’ll probably rush onto this thread later like I WAS WRONG but until then here you go
In call of duty on mobile I think the character Zero is lethal especially when you have the Christmas version. Plus I been using her more often on the battle royal match. Especially when you find a tank.
Kazuha Kaedehara from Genshin Impact is pretty lethal in my opinion. His burst is a tornado that pulls in enemies. When combined with pyro, he can be absolutely devastating.
Honestly I don’t know why I didn’t say this before but literally Sephiroth from Final Fantasy 7 and the remake and crisis core and literally every game. He’s a superboss in KH1(?) and he’s well known for being hard so yeah Sephiroth.