Quicksilver and ( especially ) Scarlet Witch. I'm convinced that Stan got Jack on the phone on a Friday and told Jack, "Come up with some characters...
Donna Troy. Back in the day, she's had like three different origin stories, the Nu52 happened and she got yet another one. I'm not sure what her deal...
Well, at least Ultimate barely focused on the school and it was mostly a (badly executed) team show while the 2017 one made everything about SCIENCE...
It just feels weird that they keep pairing him with superpowered characters or characters he has no relationship with instead of his legit supporting...