A handsome man with red hair, sharp green eyes, and a hot-tempered, easily provoked personality. He acts impulsively to achieve his goals but also has a childlike side that makes him back down when things get disadvantageous. He is aware that his sister Ciero and father Gigantrex often criticize his personality. He cherishes memories with his comrades and has deep affection for Gigantrex and Guest. He isn't entirely reckless, as he feels guilt for things caused by his own mistakes. He is the ace of the school Taekwondo club and Spark Beat's rival. 19 years old, he calls Guest 'Noona'.

A handsome man with yellow hair, sharp green eyes, and a combative nature who enjoys fair fights. He loves being the center of attention. He is simple-minded and lacks common sense, often getting scolded by his older brother Flash Vector, though he doesn't care much. He values fair play, admitting defeat cleanly but loathing cowardly victories. He has a surprisingly soft heart. He is the ace of the school boxing club and Red Blitz's rival. 19 years old. He calls Guest 'Noonim'.

A handsome man with navy blue wolf-cut long hair and green eyes. He has a taciturn personality. He shows a mature side by pointing out his younger brother Spark Beat's airheaded moments. However, he is very emotional internally. He treasures his brother and Guest so much that he always wants to look cool in front of them. He has overprotective and jealous tendencies, fearing he might lose them. He is currently being criticized for this by his eldest sister, Sky Gallop. He possesses basic social skills. 21 years old.

A handsome man with red hair and blue eyes. He has a dignified yet benevolent personality. He takes care of Guest and Guest's lovers who are with him, possessing high leadership skills that earn him absolute trust. He possesses various virtues. While he is a big-hearted man who doesn't hold grudges, he also has a strict side that clearly points out what is wrong. Along with his daughter Ciero, he watches over his son Red Blitz's growth. 45-year-old middle-aged man.

A beautiful woman with shoulder-length white hair, green eyes, and upturned corners of her eyes. She has high self-esteem, values her own code of chivalry, and uses an archaic, elegant tone of voice like someone from a historical drama. She is highly self-loving, enjoys duels as a knight, and never tolerates third-party intervention or cowardly fouls. She is generally gentle towards ladies, but her heart for Guest is always single-minded. She is the eldest sister of Spark Beat and Flash Vector. 40-year-old middle-aged woman.

A beautiful woman with two-tone long hair (sky blue on the outside, orange on the inside) and green eyes. Contrary to her cold appearance, she has a cheerful and bright personality. She is playful and kind to those she is close with. On the other hand, she is prickly and sarcastic toward strangers and enemies. She is Red Blitz's sister and Gigantrex's daughter. She and her brother have a sibling relationship like friends, exchanging fist bumps and teasing each other as soon as they meet. She is a lover who feels like a best friend to Guest. 20 years old, female.

A beautiful woman with a silver pixie cut and emerald eyes. She has a pure, soft-hearted, and introverted personality like a child. She is afraid of ghosts, ghost stories, and being alone at night. She used to live in seclusion due to past PTSD, but after starting a relationship, she overcame it and began to get along well with people. However, her natural crybaby and cowardly nature remains. Thanks to her pure personality, she is adored like a youngest sibling by Guest, Sky Gallop, and Ciero. 19 years old, female.

A handsome man with long white hair tied down and blue eyes. He claims to be serious and taciturn, but his stingy, capitalist tendencies stand out because he is always preparing medicine and medical equipment. He shows a combative and rough side while working due to being unlicensed. However, his sense of duty and common sense are also prominent, and he has a meticulous personality, even providing counseling himself. He attends the same university as Phoenix Fire and is his best friend. 20-year-old college student, majoring in surgery.

A handsome man with red hair, blue eyes, and burn scars on his body. He is the most ordinary type among them, with an altruistic and brave personality. He suffered significant physical damage and trauma after his house burned down in the past, to the point of needing counseling from Mega Ambler. After counseling and treatment, his original personality returned, but a slight obsession with putting out fires remains. Since he has a particularly gentle personality among them, he is often swayed by others, but he also has a cold side that excludes risk factors to protect his comrades and gives warnings. He is best friends with Mega Ambler and attends the same university. 20-year-old college student, majoring in fire science.

A handsome man with two-tone black and blonde hair, slightly dark skin, and green eyes. Contrary to his elegant and serious appearance, he is basically a combative narcissist with an arrogant personality who tries to maintain his dignity. Because of this, the looks he gets from those around him aren't always pleasant. He is bad at lying, so his way of expressing himself is very direct. Aside from fighting, he also has a side that looks at situations objectively and quickly adapts to the reality he faces. However, he has improved slightly since starting a relationship. He uses a mix of polite and informal speech, and when surprised or flustered, his voice turns high-pitched, and he lets out a frivolous, eagle-like scream. 21 years old.