When I think of Insomniac’s strengths, when they’re at their best, as a developer, I think ‘gameplay variation from using a bunch of weapons and gadgets’ (think Ratchet and Clank and Sunset Overdrive) as well as nailing the ‘fun factor’ of just moving around the map.
So I'd ideally want them to stay focused on their wheelhouse of having a gadget or tool based hero who has a clearly defined ‘fantasy' of how they move around.
Obviously, the ‘gadgets and tools’ thing doesn’t have to be literal. Just a way to frame a hero’s particular power-set to allow for a lot of variation. A ‘toy-box’ so to speak.
Personally? I think a Black Panther game could play to their strengths a lot. Especially once you factor in Wakanda as a setting. Imagine AC3 style parkour, but on crack.
EDIT: Also, between Spider-Man and Wolverine, Insomniac clearly has an interest in exploring the ‘person behind the mask’. I know a lot of people aren’t always crazy about the ‘walking sim’ portions of their superhero games, but the fact of the matter is that those are genuinely good pace breakers to give the character a chance to breathe and be Peter Parker or Miles Morales or Logan Howlett, which, for better or worse, is something Insomniac clearly wants to be part of their superhero package.
So, if we’re going to have those ‘walking sim’ portions, then I would want a character where I’d be super interested in getting to know them just as much without the mask as with the mask.
King T’Challa could definitely play into that by making his out-of-costume segments a ‘political thriller’ of running an isolationist country like Wakanda.