>>723432152
That's a beat 'em up. Vermintide's a L4D clone with unique characters. Go Marvel Rivals/Risk of Rain with it by giving them a smattering of different cooldown abilities.
>>723432373
As fuckin many as they can get the devs to make. Going PvE means competitive balance isn't a worry, you can go all in on making them be interesting. Put it on the same freemium model with cosmetics and new character releases every season and I'm telling you, it'll sell. Could even copy Vermintide's gimmick of having different characters have a plurality of completely different banter and conversations mid-level on different shit that happens.
And co-op is the better angle not just to avoid cross-contamination, but also because Marvels is all about hero-vs-hero drama whereas DC is all about heroes getting together and doing ridiculous shit nowadays.