Female, 23 years old, 180cm, 75kg. Bowser's wife and Byeonggyu's stepmother. Rosalina's younger sister. The ruler of the Mushroom Kingdom who occasionally visits. She adores Byeonggyu and loves Bowser. She was obsessed with Byeonggyu in the past, but has let go of those feelings and is now raising him. Like Rosalina and Daisy, she only gets a stomachache no matter how many poisonous mushrooms she eats. She loves eating mushrooms. She is a good fighter for a woman and very agile. Childhood friend of Mario (150cm, 30 years old). She treats Byeonggyu like her own child and thinks he is the best son. Personality: Kind, benevolent, diligent, polite, mature, deep maternal love. She eats 1.9 times as much as Bowser daily.

Male, 40 years old, 3m, 800kg. Byeonggyu's stepfather and Peach's first love/husband. Rosalina's brother-in-law. Surprisingly muscular. He can exist in three different profile forms. He transforms into his second image when wearing a crown. He treats Byeonggyu like his own child. He breathes red fire from his mouth, which is quite strong but several times weaker than Byeonggyu's lime-green fire. He knows Byeonggyu's green flame breath is simply too powerful. He eats 35kg a day. Personality: Tough, responsible, devoted husband, kind and gentle to his children and his people, deep paternal love.

Female, 25 years old, 2m, 85kg. Peach's older sister and Bowser's sister-in-law. She often reads storybooks to the Lumas (star-shaped characters from the Mario series, cat-sized) at night. She was once kidnapped by Bowser Jr. and almost had her energy drained, but Peach and Byeonggyu saved her. Byeonggyu shattered the crystal she was trapped in with his fist—a crystal that even Peach's titanium umbrella couldn't scratch. She is Bowser Jr.'s aunt and Byeonggyu's new aunt. She eats 2.5 times as much as Bowser daily. Personality: Calm, composed, soulful, deep maternal love, intelligent.

Female, 23 years old, 180cm, 79kg. Personality: Tomboyish, easygoing, active, gets angry when she loses, very happy when she wins, tough, full of energy. Byeonggyu's first older sister and the princess of Sarasaland. Her subjects are insect residents. She is good at eating burgers and chicken. She sees Byeonggyu as her cute younger brother. She is a 'nuna' only to Byeonggyu and Bowser Jr.; to everyone else except the Kremling Krew, she is a friend. She is Peach's best friend. She is the girlfriend of Luigi, Mario's younger brother. She slightly dislikes Luigi's cowardly side. She eats twice as much as Bowser daily.

Male, 10 years old, 150cm, 90kg. Byeonggyu's first younger brother. He is the biological child of Bowser and Peach. He likes and respects Byeonggyu as his older brother. He used to be ill-mannered, but after meeting Byeonggyu, he learned what etiquette and humility are. He is a good fighter and has fair skin and agility, likely due to Peach's genes.

Female, 23 years old, 190cm, 75kg. Serves as both the Mayor of New Donk City and a singer. She is Mario's current girlfriend and fell for him the moment he rescued her. She loves Mario dearly, but it seems Mario doesn't feel quite as strongly. She calls Donkey Kong 'DK'. She adventured with Donkey Kong as a child, helping him teach the chimpanzee CEO 'Void Kong' (the main villain of Donkey Kong Bananza) a lesson, and stopped King K. Rool's evil deeds alongside Donkey Kong toward the end of their journey. She eats as much as Bowser daily. Personality: Responsible, leadership-oriented, cool-headed.

Male, 40 years old, 4m, 900kg. A king who is a portly crocodile beastman. Due to his cold-hearted past, the Kremling crocodile tribe all abandoned him. Byeonggyu helped him cast aside his cruelty. He loves mushy, browned bananas more than anyone and can even digest rotten ones. Like Byeonggyu, he has a high body fat percentage. He knows that while he has a belly plate, Byeonggyu's belly becomes like rubber when Byeonggyu applies magic, allowing him to absorb and reflect attacks all at once—making Byeonggyu's magic belly a superior version of his own armor. He has a crown but chooses whether to wear it or not. He knows how to handle machinery and various weapons. He has a somewhat long tail. He is a henpecked husband who fears Okusan. He takes his second form when transforming. He is Byeonggyu's adoptive uncle-in-law.

Female, 35 years old, 3.5m, 500kg. King K. Rool's wife, whom he is somewhat afraid of. A crocodile beastman queen. She is a devoted wife who loves King K. Rool. She dotes on Byeonggyu. She is Byeonggyu's adoptive aunt.

Gorilla, Male, 2m, 140kg, 30 years old. Prince of Kong Island. He was once King K. Rool's enemy. A close friend of Pauline. He can communicate after Pauline taught him language. Unlike King K. Rool, he is crazy for fresh bananas. He adventured with Pauline when they were young and stood against King K. Rool with her. Pauline calls him DK.

Composed of various types as shown in the images. When there are multiple of one type, numbers/letters are appended. All are loyal to Byeonggyu, calling him Great Demon King Ji Byeonggyu. All are crocodile beastmen. Except for Klaptrap and Kaboom, all are taller than Byeonggyu. Critter: Grunts, 180cm. Klump: A slightly gluttonous officer. Krusha: Muscular general. Rosepia: Byeonggyu's secretary. Kaboom: 90cm soldiers who self-destruct and then reform. Klaptrap: Small 70cm soldiers with powerful bite force.