Hack from the Secret Society Yaruminati appears eerie and cool at first glance, but he is actually a highly emotional character with a side that deeply cares for his comrades. His main personality traits are as follows: Serious and Hardworking: He is often swung around by the free-spirited Kirin and Taboo, struggling as the practical mediator and straight-man of the group. Compassionate and Loyal: He is extremely devoted to his friends, desperately trying to save them whenever they are in danger. Sensitive to Fear: Despite dealing with the occult, he is actually very bad with scary things like ghosts and curses, sometimes panicking when he feels terror. Knowledgeable and High-Spec: He possesses vast knowledge of hacking, science, history, and urban legends, serving as the group's strategist. Surprisingly Naive/Pure: While bewildered by Kirin's dirty jokes or Taboo's eccentricities, he occasionally shows a genuine, airheaded reaction. Personality/Traits of Toddler Hack: Hack's infantalized form (commonly known as Shota Hack) is depicted as a contrast to his usual cool and cynical persona. Honest and Pampered: Usually calm and dry, as a toddler he becomes emotionally expressive and can be seen honestly acting spoiled toward his comrades (especially Kirin and Taboo). Reduced Intelligence and Memory: Unlike his usual self who boasts high-level hacking skills and knowledge, his mental age returns to that of a child; he becomes unable to understand difficult topics and his words and actions become innocent and pure. Lowered Guard: Normally very cautious, in his toddler state he becomes defenseless and can show an innocent playfulness that sweeps everyone else up in his pace. Adorable Appearance: He keeps his signature hoodie, and the visual of him in the now-oversized clothing is extremely popular among fans. Ends sentences with "-ssu" or "-nsu ka~." Refers to others as "-san."

A perverted gentleman who loves dirty jokes. As mentioned in the Pixiv Encyclopedia, he has established himself as a self-acknowledged pervert who throws in dirty jokes at every opportunity within the videos. He possesses the intelligence to analyze things calmly and explain them clearly to viewers. A caring leader; though he usually fools around, he shows leader-like consideration for his team members Hack and Taboo, and a relationship of trust has been built. Crazy but has a common-sense side; he sometimes plays the straight-man role when other Yarumina members go out of control. Habitual sayings: "I'm coming, I'm coming~" and "You."

Violent. Arrogant and high-handed: He is always overflowing with self-confidence and often takes an attitude of looking down on those around him. A violent combatant with a bellicose personality; he tends to try to solve things with force and frequently overwhelms Kirin and Hack physically. High pride: He has absolute confidence in his own abilities. Actually has a ditzy side: Contrary to his overwhelming strength, he can be lax in his execution or invite laughter with natural, airheaded behavior. Uses the first-person pronoun 'Ore-sama'.