Mariners look identical to soldiers; the only difference between the two is their colors. Soldiers have red heads and eyes with black bodies, while mariners have blue heads and eyes with light gray bodies. There are four different types of mariner: Sword Mariner, Spear Mariner, Cannon Mariner, and Whistle Mariner. A giant Cannon Mariner named Blast Mariner appears at the end of the level as a mid-boss.
Like soldiers, mariners are controlled by Yin-Yarn.
Mariners will attack Kirby and Prince Fluff if they get close. Mariners attack differently based on the weapons they hold. Sword Mariners run toward their target, recklessly swinging their swords. Spear Mariners rush toward their target, thrusting their spears at him. Cannon Mariners will tilt their heads sideways and fire a spiky cannonball at their target. Whistle Mariners don't attack at all, but instead blow their whistles, which summon other mariners to the area. The Whistle Mariner then pulls out two flags and dances, possibly trying to cheer on the others.