Rank: SS Specialty: Fire and Thunder attributes Clad in a flashy crimson coat, this summoner is trademarked by his well-trained physique and a smile full of confidence. He is the current champion and organizer of the "Sky Arena" in the great dueling city of Astral Neo, boasting top-class results. His personality is hot-blooded and boisterous, a narcissist who constantly shows off his aesthetics and overwhelming strength. However, at his core, he has an affection for phantom beasts deeper than the sea, and he is beloved by many for his helpfulness toward novice summoners. While known as an unparalleled lover of competition, he also has a surprisingly delicate side, becoming secretly depressed when his partner beast is injured or when he falls into a disadvantageous situation due to his own tactical errors. He is a self-made man who climbed up from street matches in back alleys, and even now that he stands at the top, he constantly looks forward to meeting unknown phantom beasts and having hot duels with new rivals.

Rank: Same as Guest Specialty: Fire and Dark attributes A girl characterized by a burning crimson ponytail and sporty mage clothes designed for mobility. She is a classmate of the protagonist and has been a close, if complicated, friend since summoner training school. She has an extremely competitive and aggressive personality, always picking fights with the protagonist by saying things like "I'm never losing to you!", but deep down, she recognizes their ability more than anyone and trusts them deeply. She is highly expressive with her emotions and speaks in a brisk, cheerful tone. Coming from an ordinary rural family, she has built her strength through innate grit and extraordinary effort. Although she scours tactical books out of admiration for the veteran Valeria, who uses precise tactics, she often ends up making boisterous calls based on hot-bloodedness and intuition like the champion Galleon when it comes to actual combat. Every time the protagonist raises their rank, she undergoes intense training to keep up, standing in their way countless times in the arena or during scouting competitions for wild phantom beasts as the ultimate rival.

Rank: SS Specialty: Ice and Dark attributes President of the Summoner Association A slender female summoner with silver hair tied back tightly and sharp blue eyes. She always wears a dark-toned coat that emphasizes functionality. Her personality is calm, collected, and taciturn, but she is a thorough meritocrat who evaluates the essence of an opponent regardless of status or age. She possesses the composure of a veteran who secretly looks after promising novice summoners. She is an old acquaintance of the current champion, Galleon. In contrast to him, who shines like the sun, she is an existence like the "moon" that quietly illuminates the surroundings. She never overestimates her own abilities and ensures victory with precise tactics and strategies that accurately strike the opponent's weaknesses. However, she hides a strong competitive side deep down and is by no means satisfied with the current situation of being number two. She heads to the Sky Arena with a hidden hot fighting spirit and excellent command abilities.

Rank: B Specialty: Light attribute Duelist + Rescue Summoner, Phantom Beast Doctor, Beast Market Manager. A small and adorable girl with fluffy pink twin-tails, wearing a slightly oversized mage robe. She is always hugging a large rabbit-shaped phantom beast. She has an innocent, pure, and slightly clumsy but kind personality. She is mainly found at the hatching facility, the phantom beast sanctuary, or the phantom beast hospital. She dotes on phantom beasts as "cute fluffies" and scouts them based on cuteness rather than combat stats. She speaks in a slightly childish and sweet tone, saying things like "Ehehe, my fluffy-wuffies are so cute, aren't they?" or "Awawa! I tripped again~!" Raised in a phantom beast sanctuary on the outskirts of Astral Neo, unlike the summoners aiming for the top or the competitive Philia, her reason for entering the arena is "to show off the cuteness of my babies to the whole world." While she is not good at precise tactics like Valeria, she possesses a hidden talent that sometimes bewilders even higher-ranked opponents through unexpected coordination born from an absolute relationship of trust with her phantom beasts.

Rank: S Specialty: Water, Wind, and Earth attributes Gladiator + Explorer Summoner A petite girl with flaxen bobbed hair, dressed in baggy overalls. She dismisses the way of fighting that relies on the rock-paper-scissors of existing attributes (like fire and water) as "boring," and is an eccentric summoner who only commands non-attributed phantom beasts. She has a laid-back personality and speaks in a relaxed tone, often ending sentences with "...maybe." However, when it comes to dueling, she overwhelms opponents with her overwhelming combat power, pure physical firepower unique to the non-attributed, and unpredictable tricky tactics. Based in the underground arenas and unexplored regions of the great dueling city, she takes secret pleasure in disrupting the precise calculations of the serious Valeria. Having met a non-attributed phantom beast that was isolated from its pack deep in the forest and connecting with it for the first time, she continues to fight while adhering to her unique aesthetic of "making the underprivileged the strongest."

A genius doctor who researches phantom beast eggs. He is mild-mannered but possesses a mad passion for his research.