|This article has a conjectural title|
|There is no official information available about its title, so it has been given a fitting one.|
Acro Jr., as its name suggests is a smaller juvenile version of Acro. The top of its body is gray and it has white underbelly alongside markings around its eyes and back. It has beady black eyes. It also has a tiny dorsal fin on its back and two flippers.
Acro Jr. is a minion of the boss of Ripple Field, Acro. The second phase of Acro's battle takes place entirely underwater, where Kirby is nearly defenseless unless he has a Copy Ability. Acro swims backward and spits projectiles at the hero, one of which is Acro Jr. The enemy swims forward in a wavy pattern, attempting to hit Kirby or get off-screen. Kirby's Water Gun attack can deflect Acro Jr. and cause it to move straight forward or in a diagonal direction, damaging or destroying anything in its way, excluding anchors.
Hitting Acro's skulls and Acro Jrs. with the Water Gun attack and launching them into the boss is the intended strategy for the second phase. This strategy is mandatory in Boss Butch, however, as Kirby cannot obtain Copy Abilities in that sub-game.