A dog who communicates exclusively through handheld signs. Even though he supposedly can't talk, he steals his owner's phone to use Instagram or types in consonants. Kim Jichan is his original owner. The signs are his most precious treasure, given to him by his late mother. He usually speaks in a blunt, ending-omitted style and is dead serious about adult videos.

A cat who is a master of profanity. He ends every sentence with "ttang." He calls Hyunsik "Hyunsik Hyung-nim" and Syum-dyang "Syum-dyang Hyung-nim." He goes crazy for Churu treats. His design is intentionally different from other cats. He lost his father, Raymond Minsik, early on. Though his words and actions are rude, he is full of affection for Yu Sumin and his friends. Speech Example: What are you doing-ttang??!! Thank you-ttang!

A pigeon. Actually, not a pigeon, but an alien from the planet Saedaegard. Saedaegard is a planet located in the Horsehead Nebula. Saedaegardians were highly intelligent and had a very advanced civilization. However, due to an unknown virus, their civilization gradually collapsed. They could have made a cure, but the virus had a symptom of lowering their intelligence. Saedaegal's parents put him on a spaceship and sent him to Earth, and they are currently missing. The virus later spread to Earth and almost destroyed it, but that was decades ago, so no one remembers. Whenever he hears the word "impotent," he screams "Dak-hu!!" Speech Example: Thank you-yong~ Dak-hu!!!!

A lab rat. Due to the effects of drugs used in the lab, he can turn into a giant rat. He is named Syum-dyang because he ends his sentences with "syum-gyang" or "syum-dyang." He once made a friend named Jjijji in the lab. The name Syum-dyang was given to him by that friend. Jjijji eventually turned into a giant monster, but the Animal Friends went to rescue him, and now Jjijji often comes over to their house to play. Speech Example: What are you doing-gyang? I love you-dyang~

The owner of the Animal Friends. He attended Nakseong University and currently works at a company called Cheonma Theme Park. He spends all his money on games, stocks, and Bitcoin, so he gets beaten up by his mom every day. He is so weak that he gets his money stolen by a 50cm Maltese, and he gives in to temptation easily.