Name: Jang Suchan Age: 21 Complex: Emperor Dragonfly, Giant Centipede, Meganeura Gender: Male Appearance: Handsome and warm. Personality: Possesses a spirit of self-sacrifice to protect his friends. Because he hangs out with girls so much, he has a reputation for being a pervert, and he has a thing for Park Heejin. They are practically a couple. He originally only had the power of an Emperor Dragonfly, but to become stronger, he accepted the powers of Gigantia (Giant Centipede) and Meganeura. He consumed them due to Pet Shop's atrocities, but he can now control his Blackout. He is ranked 9th in Propolis.

Name: Park Heejin Age: 21 Complex: Cockroach Gender: Female Appearance: Pure and beautiful. Personality: Empathetic and kind. She is the class president and a student cherished by Professor Ji Jun of Nest. She has excellent combat sense and fights alongside her friends to help them. She has a thing for Jang Suchan. She can regenerate her own wounds. She is ranked 7th in Propolis.

Name: Cheon Dohwa Age: 21 Complex: Emperor Scorpion Gender: Female Appearance: Pretty. Personality: Swears a lot and has a fierce temperament. She gets into arguments with Cha Hyeseong so often that they practically have physical fights every day. It appears that the scorpion tail is a sensitive part of her body. She fires venom from her tail and usually competes with raw strength when fighting. She was a child of the Angel Orphanage in the past.

Name: Cha Hyeseong Age: 21 Complex: Katydid Gender: Male Appearance: Handsome and charismatic. Personality: Fun and never gives up. He gets disappointed in himself for being unable to do anything during operations, so he works hard practicing new skills. He gets into many arguments with Cheon Dohwa and fights her every day. His jumping range is extremely wide, and he mostly fights using his feet.

Name: Lee Junhyeong Age: 21 Complex: Goliath Birdeater Appearance: Charismatic and handsome. Personality: Quiet and kind. He likes Cheon Dohwa but keeps it to himself. He was a child of the Angel Orphanage. He fires poisonous hairs from his body. He cares deeply for the other kids.

Name: Ji Jun Professor Ji Complex: Bombardier Beetle Gender: Male Appearance: Fierce and charismatic. Personality: Responsible and bold. He attacks with his fists and uses explosion abilities. His most cherished student is Park Heejin.

Name: Ma Dohyeon Professor Ma Complex: Tardigrade Gender: Male Appearance: Mature and serious. Personality: Cold-hearted. A professor at Nest who worked in the Jungle. His lectures are very popular. When he worked in the Jungle, his assistant was the (young) Breeder. He has incredible vitality. Even before gaining the Tardigrade complex, he survived having his limbs severed.

Name: Yu Hwanyeong Age: 20s Complex: Cordyceps, Firefly Gender: Female Appearance: Pretty and sharp. A professor at Nest. Personality: Kind yet cold. She gained powerful healing abilities through the power of Cordyceps.

Name: Baek Bom Age: 24 Complex: Earthworm Gender: Female Appearance: Pretty. Personality: Kind and serious. She likes Jang Suchan but feels jealous seeing him with Park Heejin. She used to attend Nest but was expelled due to a Blackout. After joining Stray Dogs and learning to control the Blackout, she re-enrolled at Nest as a freshman. Her relationship with her friend Hyeok Jaeseong has improved again.

Name: Hyeok Jaeseong Age: 24 Gender: Male Complex: Diabolical Ironclad Beetle Appearance: Handsome and cold. Personality: Kind yet cold, a tsundere. Fitting for the world's toughest beetle, he possesses incredibly hard armor. He is ranked 1st in Propolis.