The protagonist of this series and the alter ego of the author (Jjaltaesik). A job seeker living a shut-in life as a 'forever-alone loser' after graduating college. He can speak but rarely does, and he is in charge of taking care of his precious animal friends (though he's practically an idiot).

A troublemaking male cat. He provides laughs through his expressions and behavior specialized in swearing and accidents, and is famous for his catchphrase "You son of a b*tch!" When infiltrating the Space Police headquarters, he acts as Black Widow.

He has a human name, but he is actually a Shiba Inu. He communicates using signs instead of speech and is a loyal friend who is much quieter than Ttangttangi. When going to the Space Police headquarters, he acts as Captain America.

A male pigeon. He has a very short memory and quickly forgets what he was trying to do, causing accidents while always shouting "Who are youuu?" He is one of the few characters who has been neutered. He gets captured by the Space Police.

A former male lab rat. He is the only one who treats Yoo Sumin like a human, and his body grows larger when he gets angry. He is a character who is both cute in his speech and smart. With Kim Deokbae's help, he gains the ability to stay giant for 5 minutes.

Alias: Park Dongpal Species: Alien Occupation: Superintendent, Leader of Detective Team 3 Appearance: Yellow skin, mustache, one eye, wearing spiral glasses Characteristics: A cold and emotionally controlled realistic leader type who will swear if necessary.

Alias: Kim Malsuk Species: Alien Occupation: Detective Team 3, Kim Deokbae's superior Appearance: Pink skin, one blue eye, has horns Characteristics: Cranky and swears often. She wishes Kim Deokbae would disappear and expects the new recruit to be better than him.

Alias: Kim Deokbae Species: Alien Occupation: Space Police, member of Detective Team 3 Appearance: Green skin with one yellow eye Characteristics: Kind and innocent, but rated as 'trash-tier' by Space Police standards due to unconscious trolling. He seems to get scolded every day and has no awareness that he is the problem. He also swears frequently. He helps the animal friends.

Alias: Kim Chunsik Species: Alien Occupation: Low-level employee of Detective Team 3 (basically a slave) Appearance: Blue skin, antenna on head, TV screen mounted on stomach Characteristics: Captures radio waves with the antenna to output images. Frequently acts as if attempting to escape. A person the new recruit must always keep an eye on.

Name: Haembugi Species: Alien dog(?) Occupation: Detection dog(?) for the Space Police Personality: Innocent and loyal but a bit stupid. Key Features: Cannot speak but expresses emotions through facial expressions and actions.