I'd love Gladiator to appear some more. But, leaving him aside:
To me, Ann Nocenti created the best B-Villains (Miller elevated some previous ones to A-Villains, but didn't really create many new characters except the Hand, Brubaker also elevated a few, but they are corny ones like the Matador. I'd argue Bendis did the opposite and actually brought down some characters while making fun of others without elevating them). I suspect the season is crowded enough that any ones used will just be In Name Only as Easter Eggs to the fan (like the Masked Marauder in season one), but Bullet would be easy enough to adapt as a big strong guy and you have Ammo and the Wildboys as gang members. Moving away from early Nocenti, you could go with Shotgun as a guy who really loves military tech (and could sort of be an anti-Punisher in the military aspect of the story). Another example (one invented by Miller) would be Nuke. I'd prefer to save him for a Born Again adaptation, but he could be similar to Shotgun.