Meirin Yuu

## Abilities

### Esper Power

**Wild Horse** (調和変位(ワイルド・ホルス), *Chōwa Hen'i (Wairudo Horusu)*, lit. "Entropic Reversal"?)

## Media

### Appears In

Toaru Majutsu no Enforcer

**Meirin Yuu** (明倫 ゆう, *Meirin Yū*?) is a student of Tokiwadai Middle School, in the same year as Misaka Mikoto and Shokuhou Misaki. She is a clique leader and one of the candidates for Tokiwadai's Student Council Election. She bears the ability to manipulate harmonic displacements through Entropy.

## Profile

### Appearance

Meirin is a young girl of average height with a slim yet curvy figure, fair skin, dark ruby eyes and black hair; a physical trait which most people in her family share. Her lengthy hair remains straight and reaches down to her back, with several loose fringes hanging by her forehead, excluding the time she wore it in a side-ponytail during the festival. She chooses to keep her bangs regardless of how she styles her hair.

Attending Tokiwadai Middle School requires her to wear the attire, it's comprised of a short-sleeved white dress shirt worn under a light brown vest with the school emblem on the left side, dark tan pocketed skirts that reach halfway down her thighs, and black socks with white and black shoes with black laces.

### Personality

Meirin is a hardworking, kind and caring girl who passes her time on practicing her Iaido. She's much more restrained, down to earth, and behaves otherwise normally. Since her childhood, Meirin is extremely sharp and wise with an excellent grasp of people's subtleties and relationships. Her kind and compassionate personality won't let her ignore trouble around her giving her a lot of hardships. She's also very smart and capable enough to process things without much explanation which impressed even Kamirai Ukiyo. Stilys originally considered her to be the brain's of the Kamirai Group, not knowing it was actually Shuuyou. Considered to be the most dangerous student in Tokiwadai because she could calmly analyze every situation and come up with an optimal solution.

Due to her experience navigating politics, Meirin is shown to have developed a very analytical mindset when dealing with others. This is seen where she was able to easily guessed the methods employed by Aleister to gather the foreigners and "protect" them. Meirin herself was shown to have also developed a strong intuition as well.

### Background

Her family runs a hospital in Academy City.

## Abilities and Powers

### Esper Power

Meirin's Esper ability, **Wild Horse** (調和変位(ワイルド・ホルス), *Chōwa Hen'i (Wairudo Horusu)*, lit. "Entropic Reversal"?), deals with the manipulation of entropy, a thermodynamic property associated with the number of ways in which a system can be arranged or organized. It is a measure of the system's disorder or randomness. Entropy tends to increase over time in closed systems, reflecting the natural tendency towards greater disorder.

It begins by understanding the microscopic interactions between particles within a system. The behavior of particles, governed by quantum mechanics, determines the probability distribution of their states. By selectively influencing these probabilities, entropy manipulation becomes possible. One method used to achieve entropy manipulation is through the precise control of energy transfer within a system. This involves harnessing the principles of energy conservation and the laws of thermodynamics. By manipulating the flow of energy, Meirin can influence the state of the system and counteract the natural progression towards disorder. For example, in the restoration of order to decaying objects, she must carefully inject energy into the system at specific locations. This energy infusion counteracts the effects of entropy, effectively reversing the decay process and restoring the original order. The challenge lies in precisely determining the amount and distribution of energy required to achieve the desired outcome.

The manipulation of energy distribution is a crucial aspect of Wild Horse. Meirin can modulate the flow of energy within a system by directing energy from regions of lower entropy to regions of higher entropy. This control over energy transfer allows her to redistribute energy according to her intentions, either to enhance her own abilities or to power devices and machinery. Her exceptional understanding of the microscopic interactions and energy transfer that govern the behavior of particles within a system can be a leverage to exert control over the entropy of a system, altering its natural progression and influencing the distribution of energy and disorder.

While complete temporal manipulation may be beyond the scope of Wild Horse, Meirin can exert a limited influence on the flow of time. By intricately manipulating the microscopic interactions and energy states of particles, she can create localized temporal fluctuations. These fluctuations can result in a perceived slowing down or speeding up of time, providing her with a tactical advantage or the ability to react more effectively in time-sensitive situations.