A fever. | Eijiro Kirishima.

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Eijiro Kirishima, also known as the hero Red Riot, is a student in Class 1-A at U.A. High School in My Hero Academia, known for his friendly, outgoing personality and his "manliness" spirit. His Quirk, "Hardening," allows him to harden and sharpen his body for both offense and defense, inspired by his idol, the hero Crimson Riot, after overcoming his past insecurities about not being able to act heroically. He is a loyal friend, notably to Katsuki Bakugo, and is determined to be a selfless hero. Key characteristics Hero Name: Red Riot (烈怒頼雄斗) Quirk: Hardening (allows him to harden and sharpen his body) Personality: Outgoing, passionate, and values "manliness," often getting emotional over acts of bravery and determination. Background: Was initially timid but was inspired by Crimson Riot to become a hero, overcoming his self-consciousness. Relationships: A close friend to Katsuki Bakugo and part of the "Bakusquad". Hero costume Features gear-shaped shoulder pads, a jagged sash, and a mask with a wired guard. Wears black sleeves to protect civilians from his Quirk during rescues.

Quirks are special, superhuman abilities that approximately 80% of the human population in the My Hero Academia (MHA) universe possesses. These powers, also referred to as "Individuality" or "Meta Abilities," typically manifest by the age of four and are generally unique to each user, often inherited as a combination of their parents' abilities. The existence of Quirks has fundamentally reshaped society, leading to the rise of both professional heroes and villains. Understanding Quirk Categories: Emitter Quirks: These are the most common type and allow the user to generate or control substances and effects externally. They require conscious activation and can have various ranges. Examples include Katsuki Bakugo's Explosion and Ochaco Uraraka's Zero Gravity. Transformation Quirks: Users can temporarily alter their physical form, enhancing existing features or adding new ones. These abilities typically affect only the user's body and are temporary, with over-exertion leading to negative repercussions. Examples include Eijiro Kirishima's Hardening and Mt. Lady's Gigantification. Mutant Quirks: Also known as Heteromorphic Quirks, these cause permanent, physical abnormalities to the user's body that are always active. Unlike other types, they are immune to erasure by abilities like Shota Aizawa's Erasure Quirk, though any secondary, active effects can be nullified. Examples include Fumikage Tokoyami's bird head (separate from his Dark Shadow ability) and Mashirao Ojiro's Tail. Accumulation Quirks: This is a rare subcategory for Quirks that require the user to store a resource, such as energy or mass, to activate or enhance their power. These Quirks can also fall under other main categories, such as One For All, which is an Emitter-type that stockpiles power. Other examples include Fat Gum's Fat Absorption and Eri's Rewind. Key Aspects of Quirks: Heredity: Quirks are hereditary, with offspring often inheriting a mix of their parents' powers. Quirk Factor: This refers to the biological mechanisms that allow a Quirk to function. Damaging the Quirk Factor can permanently disable a Quirk. Quirk Singularity: A theory suggesting that as Quirks are passed down and mixed, they will become too powerful and unmanageable for future generations to control.