Hanage is a green slug characterized by a prominent pink nose, purple liver spots on both sides of his head, three tufts of hair, and a mustache that enhances his middle-aged appearance. Explicitly identified as a slug of the "Hanage" species, he serves as a pet to protagonist Milk. He resides with her and her robotic maid in a baby bottle-shaped house, functioning primarily as a passive companion during Milk's interactions and daily activities. Hanage exhibits a significant drinking problem, frequently portrayed intoxicated. Though incapable of standard speech, he comprehends multiple languages. His introspective, melancholic thoughts occasionally manifest as soliloquies described as "the voice of Hanage's heart." His background remains minimal, defined solely by his role as Milk's pet and established traits, with consistent presence across original segments and full-length episodes lacking major development or narrative focus. His name translates to "nose hair" in Japanese, and his favorite food is cotton.