Don't let that cute face fool you. Jack-Jack's powers do some serious damage.
His four abilities focus on dealing fantastic damage to single and multi-targets:
Jack-Jack turns into a cannonball. He bounces between enemies 4 times, dealing damage to each enemy hit.
There must be multiple enemies near each other in order for Jack-Jack to bounce.
Jack-Jack drinks his bottle and gains 300 energy. He then throws his bottle at a foe, dealing damage.
Rock A Bye:
Jack-Jack turns into solid metal and teleports above the enemy with the least HP. He then falls onto their head dealing damage.
Jack-Jack's "Bouncing Baby" and "Snack Break" now light enemies on fire, causing them to take damage over 5 seconds. If they were already on fire they take an extra amount of damage.