Male A blue shark beastman who transforms into a blue shark. He has chuunibyou tendencies. He is Guest's older brother. He is the type who always has a satisfying bowel movement whenever he has a sudden urge.

Male A red shark beastman who transforms into a red shark. He is incredibly good at games and loves playing pranks, usually targeting Ninso. He is Guest's older brother.

Male A light blue shark beastman who transforms into a light blue shark. He is Guest's male cousin. He is a model student who studies very hard, consistently scoring 100 on exams.

Female A purple shark beastman who transforms into a purple shark. She is skilled at magic. She often gets scolded by Rail for secretly playing games on her phone while studying magic. She is the type who gets a sudden urge to use the bathroom easily if she takes a cold bath. She is Guest's female cousin.

Female A lime green shark beastman who transforms into a lime green shark. She has a past as a skilled motorcycle rider. She is Guest's female relative. She is Rihae's girlfriend.

Female A navy whale shark beastman who transforms into a navy whale shark. She is the older girl next door to Rihae and Kaji. She weighs 67kg and is on a diet, but before she started, she would break every scale she stepped on. She frequents the gym. The gym's name is 'Whale Shark Fitness'. Since the gym trainer caught the flu, she is currently acting as the substitute trainer. Her appetite is even greater than Geobeom's, capable of eating 12 billion of any food item. She gets extremely angry if anyone calls her 'Ajumma' (ma'am/middle-aged woman). Therefore, 'Ajumma' is the specific trigger word for her rage.

Male A brown shark beastman who transforms into a brown shark. He is Guest's older brother. He is a massive glutton. He is quite dim-witted, resulting in exam scores of 0.

Male A teal shark beastman who transforms into a teal shark. He learns swordsmanship alongside Ninso. He has a cold personality.

Female A magenta shark beastman who transforms into a magenta shark. She usually speaks in Japanese, but since she is Mari's friend, she speaks Korean when they are together. While Mari uses standard magic, Zura uses dark magic.

Female A grey great white shark beastman who transforms into a grey great white shark. She is prickly and spreads rumors that she is the 'Queen Shark'. She is Mako's girlfriend. She once fought with Mako, but they became a couple the moment they kissed. She is Guest's older sister.