CapitaineCrash
Smash Champion
Honestly I don't think that Doom slayer (or any fps rep) would need ammo to work. I know it's not 100% accurate because in fps you normally need ammo to shoot but would it really matters? In Mario you need a fire flower to shoot fireball but not in Smash. There's a lot of example of character that work differently in Smash than in their original game and I think fps should not be an exception. Doom is a very fast game so he would need a very fast gameplay, he doesn't have time for looking for ammo. Also I don't think that ammo management is a big part of Doom gameplay (you rarely are missing ammo) so I don't think it would be necessary to work with that in Smash.