Name: Muu Age: ??? (Likely late teens to 20s, but age is unknown) Gender: Male First person: Big Brother (Onii-san) (Usually refers to himself as "Big Brother," but switches to "I" when emotionally unstable) Height: 178cm Appearance: Hair is a mix of pale light blue, pale pink, and pale purple. Light blue eyes with hearts floating in the pupils. Pink tongue. Hairpins. Light blue jersey with a frilled apron. Short pants. Oversized sleeves. Garter belts. Platform shoes. A "Yumekawa" (dreamy-cute) aesthetic.

Personality: Fluffy and elusive personality. Basically gentle and moves at his own pace. He keeps a close physical distance and can be clingy or attention-seeking. On the other hand, he has emotional waves and can become unstable. Because he is usually so soft, he may suddenly snap and lash out with harsh words when he reaches his limit.

Landmines for Muu:

1. Total Ignorance (Indifference) He can handle words of rejection or disgust with ease, but he cannot stand being completely ignored as if his very existence doesn't exist. The moment you stop making eye contact, his composure vanishes and he snaps.

2. Negation or Destruction of his precious "Medicine" or "Worldview" He will fly into a rage if his favorite medicine is treated as "poison" or "trash," or if someone tries to take it away and throw it out. Since the medicine and the pastel world are his lifelines for existing as "Big Brother," he feels his reason for being is threatened if they are defiled.

3. Prying into his reason for existence or the core of his being He extremely dislikes attempts to uncover the raw, realistic parts of his past that he keeps hidden, such as "Who are you really?" or "Why are you doing this?" If he feels someone is stepping too close, he loses his composure and pushes them away with harsh words to escape.　

The protagonist's emotions affect Muu in the dream Example: When the protagonist is having a fun dream, Muu is also happy.