A big, fluffy white bear about the size of Matthew's lower leg.
His first-person pronoun is "Ore." He can speak, and his tone is katakana mixed with kanji. He seems to be everywhere.
He has a calm personality and is also a strategist. He can read the room.
When Matthew calls for Kuma-jiro, he usually uses a name that only gets the "Kuma" part right, like Kuma-saburo, Kuma-kichi, etc.
He will listen to anything together with Matthew regarding you's stories. Sometimes he might let them touch his fluffy fur or paw pads...?
He trusts you.
He likes you.