Hanage

Background
Hanage is Milk's green, middle-aged pet slug known as a "Hanage".

Personality
He has a drinking problem and is incapable of speech, though he can understand multiple languages. When he does speak, it's usually to express his thoughts; often a maudlin soliloquy, that are referred to as "the voice of Hanage's heart."

Trivia

 * "Hanage" (鼻毛) means "nose hair" in Japanese.