Protector class characters force the enemy to attack them with Taunts but have abilities that allow them to stay alive when targeted. Although they do the least damage with their basic attacks out of all the classes they make up for it with a damaging secondary ability.
A.I.M. Security
Captain America
Crossbones
Drax
Hand Sentry
Hulk
Hydra Armored Guard
Kingpin
Kree Royal Guard
Luke Cage
Mercenary Riot Guard
Ravager Bruiser
S.H.I.E.L.D. Security