Blanka has low health in comparison to other enemies in the collab, but sports high speed and a high knockback count along with rebound, fast attack rate and a powerful Omni Strike ability which increases Blanka's range by 190.
At higher difficulty levels however, it will be better to nuke him with something like Awakened Bahamut in order to not activate all his knockbacks, as that will cause its DPS to skyrocket.