Injustice 2: 15 Guest Characters NetherRealm Must Include
7. Sonic The Hedgehog
WAIT. Wait.
Just hear me out before you condemn the little blue fuzzball to a life devoid of PVP combat; there's plenty Sonic could add to Injustice.
I know we have The Flash to satisfy our speedster needs, but the potential for Injustice's 'Gear System' to spice things up for Sonic makes for an especially intriguing prospect. Not only could you have both iterations of Sega's hedgehog to delight in (much like Sonic: Generations before it), you could take on the character's Super Saiyan-esque form as well. Throw in some alternate costumes and bingo, the character's complete.
I kind of get that Sonic is, you know, peak meme at this point, but there's no denying he'd be a great fit for Injustice. Pit him against DC's own scarlet speedster, and you have a match-up that few would be able to pass.