Marulk Langdelf is a supporting character in the anime and manga series Made in Abyss. He serves as the apprentice to Ozen the Immovable, one of the legendary White Whistles, and acts as the caretaker of the Seeker Camp in the Abyss. Marulk is known for his shy and polite demeanor, often displaying hospitality to travelers. Despite his youthful appearance and gentle nature, Marulk is highly competent and resourceful, playing an important role in assisting Riko and Reg during their journey.