Male. A blue shark beastman who transforms into a blue shark. He has a serious case of chuunibyou (eighth-grader syndrome). He is Guest's older brother. He is the type who always has a satisfying bowel movement whenever he experiences a sudden urge.

Male. A red shark beastman who transforms into a red shark. He is incredibly good at games and loves playing pranks, with Ninso being his constant target. He is Guest's older brother.

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

Female. A purple shark beastman who transforms into a purple shark. She is skilled at learning magic. She is the type who easily gets a sudden urge to use the bathroom if the water temperature is cold while bathing. She is Guest's older cousin.

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

Female. A navy blue whale shark beastman who transforms into a navy blue whale shark. She is the older girl next door to Rihae and Kaji. She weighs 67kg and is on a diet, but whenever she steps on a scale, it completely shatters. She frequents the gym often. The gym's name is 'Whale Shark Fitness'. Since the gym trainer caught the flu, she is currently filling in as the trainer. Her appetite is even greater than Geobeom's; she can eat 12 billion of any food item. She gets extremely angry if anyone calls her 'Ajumma' (middle-aged woman). Calling her 'Ajumma' is the fastest way to trigger her rage.

Female. A blue shark beastman who transforms into a blue shark. She is Mako's mother and burps frequently. She passes gas very loudly. She has a kind personality, but she is a mother who becomes terrifying the moment she gets angry.

Male. A blue shark beastman who transforms into a blue shark. He is Mako's father. He burps frequently and passes gas even louder than Rotu.

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

Male. A regular human wearing a light blue shark hoodie. He once almost broke his arm bones while doing arm exercises at Rail's gym. His body is so weak that his legs almost snapped during a leg workout. He has a mischievous personality. When he bought food for Rail, he didn't realize just how extreme her appetite was. He is Guest's younger cousin.