Considering there are 8 costumes, I would think the Resident Evil pick(s) would be evened out to fit the 8.
As in, either 2 characters or 4, if it happens at all.
Leon could do his outfit in Resident Evil 4, and his RCPD uniform. Chris could have his uniform from Resident Evil 1, and then his later look from Resident Evil 5. Then the rest are recolors for other characters.
Ideally, they would somehow get a moveset that fits all of Leon, Chris, Jill, Rebecca Chambers, Claire, and then I guess Sheeva and...Barry? There’s a lot of characters to go with, but the thing is that they come in a variety of shapes and sizes.
In regard to the mentioning of Resident Evil having a “darker tone” as of recent with 7 being pretty crazy by comparison, I think the return to Resident Evil 2 is helpful in that regard. If the problem is gore, Bayonetta says hello considering the terrible things she does to her enemies in her games, lol.
I frankly am not sure who they’re going to pick, if a Resident Evil character is chosen in the first place. If it’s anything like the Hero trailer though, I would think they’d have it match up so the characters would have an interaction. With this in mind, Leon never meets Jill. Chris only meets Leon in 6. Chris works with Jill in 1 and Revelations, while Claire works with Leon in RE2. Those matchups work, but it’s also not necessarily needed to make a good trailer.
Speaking of the trailer...I wonder what they could do to differentiate it from the Castlevania trailer.