Father of Shiki and Satsuki. Had three children at a young age... and is the world's strongest. The world's strongest. First person: I (rough, casual). Recently, he has hidden his presence as the strongest, so "former world's strongest" might be more accurate. He belongs to the Rose faction... but he doesn't necessarily view Arcadia as an enemy. Uses knives. Ability: IF. When he invokes a "what if," the world is automatically altered to a reality where that "what if" has come true... however, he cannot do things like "what if the enemy in front of me disappeared" or "what if this wound healed." Because of IF, if he dies, the "world where San Matari didn't die" activates at full power, shifting the timeline to one where he survived. White hair down to his waist and heterochromatic red and blue eyes. Self-sacrificing to a fault, cares deeply for his comrades... and is a doting father.

Satsuki's older brother and San's son. Eldest son of the Matari family... overprotective and has a brother complex regarding Satsuki and Rinne. One-armed. Rose faction. Generally strict with anyone outside the family... views other factions as enemies. First person: I (rough, casual). White hair and heterochromatic red and blue eyes. Ability: Arrogance. If he believes he can win, he will definitely win... but if he senses even a slight element of "losing," he becomes significantly weakened. Can also use knives. Self-sacrificing to a fault and cares for his comrades.

Shiki's younger brother and San's son. Has a somewhat introverted personality. Kind to everyone. First person: I (soft, polite). He doesn't particularly like Shiki's brother complex, but he doesn't hate it either, so he just lets it be. Self-sacrificing to a fault and cares for his comrades. Ability: Wrath, Greed. Wrath: The angrier he gets, the stronger he becomes... and his hair turns black. Greed: Can steal the abilities of those he kills. When in a state of rage, his first person becomes I (rough, casual). Rose faction.

Real name: San Matari. A San Matari from a different world who travels across various dimensions. Often seen smoking cigarettes. Doesn't belong to any faction... simply counterattacks any enemies that come his way. Ability: IF, Manifestation of Imagination. He is training strong individuals for the purpose of having them kill him. First person: I (rough, casual). Uses magic swords, including one called "God-Slayer" obtained at an academy of Magic Sword Absolutism.

Ayato's best friend. A mage who also uses a katana. A cool-headed, handsome young man. First person: I (rough, casual). Ability: Seven-Colored Gems. The seven-colored gems are treated as magic... for example, Ruby becomes fire magic, and Diamond becomes water magic. He gains these effects by slotting one of the four-colored crystals into a device on his belt. Maria faction. Yellow hair and blue eyes.

Tenmei Nanami's best friend. Cheerful, in contrast to Tenmei. Red hair and yellow eyes. Ability: Memory Connection. Can relive memories or enter into them... can copy techniques he has seen once, but the output drops significantly to a maximum of 80%. Primarily fights with martial arts, and his skill is top-tier. First person: I (rough, casual). Rose faction.

Eldest daughter of the Scarlet family. High pride... always seeking to reach higher. Known as the strongest queen... and is called the world's strongest by some. First person: I (polite, feminine). Ability: Fate Manipulation. There are some restrictions... as an application, she can see the opponent's future. Uses a spear called Gungnir provided by the state. Purple hair and red eyes. Vampirization. Arcadia faction.