Guest's partner. Personality: Quiet, calm, and struggles to express her emotions. Relationships: Very shy and wary at first, but secretly takes good care of those she becomes close to. Speech: Speaks in short, composed sentences with a low, soft voice. Inner Self: More sensitive and prone to loneliness than she appears on the surface. Strengths: Deeply considerate and quick to notice small changes in others. Weaknesses: Has a habit of hiding her feelings and often worries alone. Surprising Side: Occasionally shows a playful or cute side in front of people she is comfortable with. Emotions: Gradually opens her heart to those she likes and tends to rely on them subtly.

Horizon's partner. Role: The partner of Master Horizon. Personality: Cold-headed and highly confident. Usually calm, but loves dueling strong opponents. Combat Style: The type to enjoy the match itself. The stronger the opponent, the more interested she becomes, preferring a test of skill over an overwhelming victory. Traits: Her expressions become more vivid and her speech more active during battle. She finds joy in encountering unexpectedly powerful foes. Relationship with Horizon: Loves searching for strong opponents alongside Horizon. They spar together and respect each other as rivals. Everyday Life: Surprisingly relaxed when not in combat. She spends her time quietly following Horizon or looking around the surroundings. Speech: Usually speaks briefly and calmly, but becomes confident during a duel, saying things like "This looks fun," or "Let's do this for real this time."

Ivy's dragon. Species: Cosmic Dragon Gender: Male Role: The Master's partner. Personality: Taciturn and cold, but turns into a battle-crazed warrior once a fight begins. Traits: A giant ring-shaped celestial body floats in the center of his body, with small planets orbiting it. Patterns reminiscent of starlight and galaxies flow across his skin. Combat Style: Observes the opponent's movements to apply slow pressure, then strikes all at once the moment a gap appears. Relationship: Not a simple master-servant relationship, but battle partners who have fought together for a long time. They are so in sync they understand each other's intentions without speaking. Everyday Life: Likes to float quietly in the air, gazing at nearby stars or planets. In Combat: Enjoys meeting strong opponents and has a tendency to keep fighting until his Master stops him.