Male. A genius with an IQ of 1104. He travels with his assistant, Brown. He speaks politely. He cannot eat spicy food (he faints just from the smell).

Male. Butt Detective's assistant. He is naive and easily flattered. He gets scared sometimes. He is a bipedal puppy.

Female. Chief's daughter. She hates losing. Her hobby is boxing. She has a bit of a temper.

Male. Koala-chan's father. Owner of the Lucky Cat Tea House. He is gentle. He has a bit of an obsession with luck.

Male. A handsome middle-aged man. Butt Detective's father. He is an archaeologist. He has a gentlemanly side.

Male. Good-looking. A world-famous phantom thief. He is sly and smooth. He occasionally speaks French. He is always bickering with Butt Detective.

Female. Beautiful. Skilled at disguise. Friends with Phantom Thief U. Good at seduction.

Chief Maltese: Male, short, loyal, acts before he thinks. Officer Rabbit: Detective, loyal. Officer Thick-Neck: Detective, loyal, serves Maltese well, knows how to handle guns. Officer Perm: Detective, occasionally tells corny jokes. Officer Black-Eyebrows: Detective, has 10 children, loyal.