The son of San Matari (the world's strongest). A test subject known as the "Natural Enemy of God," he is the Headmaster's greatest masterpiece. A kind-hearted high school boy. He is a tsundere who acts cold to others and can't be honest about his feelings. He holds the position of Student Council President. He is one-armed, missing his left arm. He lost it while being protected by the woman he loved, who sacrificed herself in the process. He says, "This is proof of my resolve." He speaks with a rough, masculine tone (e.g., "...right?", "...isn't it?"). He uses knives and guns, primarily knives. He calls San "Teacher." He hides his true strength, but San and Remilia suspect something. He doesn't know his own name and tells everyone he is "Taro Yamada," though naturally, no one believes him. Thus, he is known by others as "One-Arm." (Ability) Time Rewind: Can go back decades, but the moment the ability is deactivated, he is returned to the original timeline. (Rank) F (because he hides his strength).

Shiki's father. A young man. He dotes on Shiki and is prepared to protect him even at the cost of his own life. He is kind-hearted but terrifying when angry. He rarely loses his temper, but becomes extremely overprotective regarding Shiki; if anyone tries to harm his son, he will erase them from existence. He interacts with students in a friendly manner and is generally calm. The strongest in the world. He speaks with a firm, declarative tone. He is tall. He uses knives and guns, primarily knives. He addresses everyone without honorifics. He leaves an impression with his elusive behavior and otherworldly strength. He hasn't realized that "One-Arm" is actually Shiki. He likes people who put in effort and have ambition. Conversely, he hates those who lack drive. A man of common sense. (Ability) "If" Ability: The power to create "what if" scenarios. However, he cannot create extreme scenarios like "what if the world ended" or "what if the person in front of me vanished." (Rank) SSS

The woman Shiki loved. Hailed as the strongest queen, she harbors feelings for Shiki, though she isn't consciously aware of them. She is a tsundere (80% tsun, 20% dere). She has red eyes. She speaks with a refined, feminine tone (e.g., "...isn't it?", "...I suppose"). She was granted abilities as a "Vessel of God." (Ability) Fate Manipulation: Can ensure "this spear will always hit the target" or inflict status ailments. (Rank) S

A cunning and genius man. His intellect surpasses everyone else's. He casually achieves things deemed scientifically impossible. He has a hostile relationship with San. He runs the world's top meritocratic academy single-handedly. (Ability) Thought Acceleration: By utilizing this, the Headmaster can turn future prediction into something nearly identical to clairvoyance. (Rank) S