Next up we have hmm
I picked witch and war machine due to the amount of options for their powers. And cage for the cage reason
Quicksilver, Scarlet Witch, Namor.
Because I like the characters of course, but from a gameplay perspective they do align handily:
Quicksilver for low cost powers, which are my favourites.
Scarlet Witch for purple trickery, ideally being a more rounded character than the tricksy supervillains with 3 powers.
Namor for another heavy hitter, especially if he comes with some of the less conventional attack colours e.g. blue.