I'd do the same

Mewtwo's face

I'd name him Vegeta. (Cause both were experimented on/genetically altered during childhood, and are super powerful. And because animeception.)

Mewtwo: "No no this is not happening I was powerful and secluded and awesome now I am horrible and given the gayest name ever"

You can't name Mewtwo Mr.Snugglekins.
It would end up Mr.Snuggleki