Mayumi Saegusa

is a prominent female character in the The Irregular at Magic High School light novel series. She is the former Student Council President at First High School and the daughter of the 10 Master Clan's Saegusa Family.

Considered to be a prodigy in the magic community, she is nicknamed the "Elven Sniper" for her extraordinary talents in long-ranged precision shooting. She is also known as the "Elven Princess" for her beauty in tandem with her and innate magical ability. She was one of the "Triumvirate", the three strongest third year students at First High School, which also includes other notable students such as Katsuto Juumonji and Mari Watanabe.

Background
Mayumi is the daughter of Saegusa Kouichi, the head of the Saegusa Family from his second wife, after the first died. Their family bears the number Seven (七) in their name and is one of the two most influential families among the Ten Master Clans. She has two older half-brothers and two younger twin-sisters, Izumi and Kasumi, making her the oldest daughter of the main family and the third child. Due to her position as the oldest daughter in the Saegusa family, her beauty and her exceptional ability is considered to be one of the "veritable rising stars among blue bloods."

Appearance / Personality
Mayumi is a young lady who is known for her natural beauty. It is stated during her internal monologue that she stopped growing (height) in her third year of middle school, which makes her slightly shorter than average. Her limbs are described as quite long despite her short stature, and her chest is also large in proportion to her height.

Excluding her height, Mayumi is described as someone with a well-rounded personality and a feminine side. While it is hard to notice, she cares about others in her own unique way, so she fits the bill of being an "older sister" perfectly. She is generally quite confident in her appearance when in the presence of others.

Abilities

 * Magic:
 * Dry Meteor: Mayumi's anti-personnel finishing strike that combines all four processes of carbon dioxide convergence, condensation, acceleration, and release, relying on the shock wave and carbon dioxide poisoning to render the enemy immobile. She creates a block of dry ice about the size of a child's fist and fires it at a speed that the eye can't follow towards the target. Upon impact, the dry ice vaporises and rushes into the lungs; the shock at the sudden lack of oxygen rendering the opponent unconscious.
 * Hale Particles: A Speed-Type Magic that turns air molecules into ice particles and then applies acceleration to those ice particles at sub-sonic levels. It is a highly efficient magic and requires a lot of power when used during a hot season.
 * Magic Bullet Shooter: Possibly a variant of Dry Blizzard. The magic uses dry ice pellets as bullets that fly at a supersonic speed, enough to penetrate armour, a phenomenon impossible in nature.
 * Multiple Bounce: A Speed-Type Magic that takes advantage of the kinetic energy vectors and reverses them.
 * Multi-Scope: A long-ranged Visual Systematic Sensory Magic that is used to observe a physical object from multiple angles like a visual radar. It also enables Mayumi to expand her vision beyond obstructions like walls. Though it's classified as magic, but in Mayumi's case, this ability is an inborn special ability (superpower) of hers that can be freely used.
 * Counter Spell
 * Psion Bullet: One of the simplest forms of magic. However, it requires extremely precise control in order to destroy just the activation sequence and avoid any extraneous damage.

Trivia

 * Mayumi is voiced by Kana Hanazawa in the anime adaptation of The Irregular at Magic High School.
 * She shares a voice actor with: Suiko Minahoshi (Boogiepop 2019), Hanezawa (Ground Control to Psychoelectric Girl), Anri Sonohara (Durarara!!), Ruri Gokou (Oreimo), Raphiel Shiraha Ainsworth (Gabriel DropOut), Riko Androids (Kemeko Deluxe!), Ayse Khadim (Ladies versus Butlers!), Hinata Gokou (Oreimo), Tomoka Minato (Ro-Kyu-Bu!), Koume Ogi (Angel's 3Piece!), Erii Harue (A Certain Scientific Railgun).

External Links / References

 * Mahouka Koukou no Rettousei Wiki