Classic Batman is an Agility class hero, available through Arena invasion events. As his passive boosts all versions of Batman (character) even when not on the team, he is a great addition to any roster.
While a great boost from the roster, he is generally not the biggest threat in a match. His most notable feature in combat is his s2 Blinding Bat which could blind an opponent (may apply to next opponent if last hit KOes). Avoid attacking him while blinded as it would be ineffective and he would receive power.