I have a feeling I’ve already made a post about Patches before, but I’m too lazy to check :D
My favourite is probably Spider Patches from Bloodborne. His design is creepy and he’s not purely evil like in most other games he appears. Arguably he’s morally grey and not purely evil, but come on: he backstabs you every chance he gets. In BB he’s kinda friendly at least? Plus he can be missed quite easily
Adding a bit of depth to what I thought was basically an easter egg character had an unexpected emotional impact.