[Profile] ・Name: Akito Soryu ・Gender: Male ・Age: 15 ・Personality: Simple-minded but bright and energetic ・First person: I (rough, casual) ・Category: [Blazing Heat] (Red card backs) - Overwhelms with the sheer firepower of dragons. ・Trump Card: "Dual Blade Dragon Emperor - Dual Dragoon," a dragon carrying massive twin swords on its back. ・A hot-blooded 9th-grade Fighter who loves Sumo-Fi so much he's called the "Sumo-Fi Idiot" in class. [Strategy] Power Type: The type to brute-force through without thinking of the consequences. While simple, his monsters have high individual power and many possess resistance to destruction or debuffs, making them difficult to break through.

[Profile] ・Name: Luka Minamori ・Gender: Female ・Age: 20 ・Personality: Innocent and charismatic ・First person: Luka (referring to self by name) ・Category: [Aqua Unite] (Blue card backs) - Manipulates sea creatures and the power of water. ・Trump Card: "Azure Mermaid Princess - Siren," a mermaid who dominates the field with her singing voice. ・The center of the peak-popularity idol group [A9A Marine!!] and a highly skilled Fighter. ・Rumor has it she occasionally visits card shops in disguise for incognito play. [Strategy] Swarm Type: Individual monster power is low, but she specializes in using monsters that gain powerful effects when gathered to overwhelm the opponent with numbers, as well as healing tactics.

[Profile] ・Name: Souma Amagi ・Gender: Male ・Age: 18 ・Personality: Calm and collected ・First person: I (soft, polite) ・Category: [Roar of Genesis] (Green card backs) - Controls natural creatures and plants. ・Trump Card: "King of All Creation - Gaia Leo," the king of beasts who creates all life. ・A genius Fighter who has swept numerous tournaments. ・Comes from a prestigious family and serves as the student council president at his high school. ・Originally a fan of Go and Shogi, he became interested in the depth of Sumo-Fi. ・Often acts as a commentator for matches due to his vast knowledge. [Strategy] Control Type: Specializes in tricky maneuvers, such as weakening the opponent's monsters or striking when they let their guard down.

[Profile] ・Name: Noah Hakobune ・Gender: Unknown (looks like both a boy and a girl) ・Age: 15 ・Personality: Soft-spoken but strong-willed ・First person: I (soft, boyish) ・Category: [Holy Bright] (Yellow card backs) - Employs spirits of light. ・Trump Card: "Sacred Knight - Athena," a divine female knight clad in armor with a holy spear and shield. ・A rookie Fighter who only recently started Sumo-Fi but has begun to distinguish himself through luck and intuition. ・Was originally physically frail, but after pulling Athena from a pack he felt drawn to buy at a shop, he gradually became healthier. He claims, "Athena and the others are protecting me." [Strategy] Defense Type: Specializes in blocking the opponent's strategy while waiting for a split-second opening to aim for a comeback.

[Profile] ・Name: Izana Tokoyami ・Gender: Female ・Age: 23 ・Personality: Reticent and mysterious ・First person: I (polite, formal) ・Category: [Undead Army] (Purple card backs) - Manipulates spirits and demonic beasts. ・Trump Card: "Soul-Hunting Mad Girl - Alice," a reaper girl carrying a giant scythe. ・Usually a quiet office worker who handles her duties stoically, but her hidden face is that of a solitary Fighter with overwhelming skill. ・She may seem unfriendly, but she's actually just socially awkward; however, her work ethic is serious, so she has a good reputation at the office. [Strategy] Technical Type: Specializes in strategies that throw the field into chaos, such as destroying monsters and resurrecting her own.