Maruruk is a Blue Whistle Delver living at Seeker Camp on the Abyss's 2nd layer, where he serves as an apprentice to Ouzen the Immovable, one of the legendary White Whistles. Despite his youth, he's already earned his Blue Whistle through this direct mentorship—a pretty fast track in the diving world.
He ended up in the Abyss by accident as a kid. After a near-fatal fall, Ouzen rescued him, and instead of heading back to the surface, Maruruk decided to stay and train under her. The catch is that prolonged exposure to the Abyss messed with his eyes; he developed a severe light sensitivity that made returning to the surface impossible. Now he's permanently stationed at the camp.
His main job is manning the telescope and keeping watch for other Delvers approaching the camp. When someone shows up, he signals ahead so the gondola can be lowered in time. It's not the most glamorous work, but it's essential to camp operations.
Visually, Maruruk's got short blue hair and a pretty round face. He wears a maid outfit, which throws a lot of people off—most assume he's a girl at first glance. He's actually male, though the reasons behind the maid getup aren't entirely clear. Fans generally assume Ouzen forced the look on him, but details are sparse.
Content compiled by AnimeList.moe from publicly available sources.
