He has yellow skin, and has wings. In season 4, he gives Doori and Hari a Wind Cube and a Lightning Cube.
Jubi (주비)
He is a royal "vampire" and has white hair. His brother, Zion, doesn't like him. He is Gaeun's boyfriend.
Ian
He is Kang-lim's older brother. He has dark purple hair and dark purple eyes.
Guido-Hyun (귀도현)
She has green hair and wears a white shirt and a green skirt. She can make plants grow faster. She is a new character that appeared in Season 5.
Chungha Kim (김청하)
He has green skin. He often wears a cape and blue shorts.
Shinbi (신비)
He is a young, chubby boy with blue eyes. He is Hari's younger brother.
Doori
He has black hair, green eyes, some freckles and wears glasses. He lives in Room Number 808. He is the owner of the Monster Forum
Hyun-woo Kim (김현우)
She has short brown hair, wears a pink jacket, and is brave. She has a younger brother.
Hari
She has long red hair and is a member of Aegis like Leon.She likes Leon.
Sarah (사라)
He has blond hair, blue eyes, and wears a white robe with blue and yellow also with grey boots. He likes Hari.
Leon
He's Kang-lim's father. He is a tall strong man.
Guido Gon (귀도 곤)
She has long black hair and looks very sad most of the time. She is Ian's girlfriend.
Gaeun
He has dark green eyes and black hair. He likes Hari and she likes him too.
Kang‑lim