Gyūki Hoori

History
Just like Otohime, Gyūki was abandoned when he was a baby. His parents placed him outside of a martial arts dojo in a small village before taking off with his brother. During his early childhood, Gyūki didn't mind that his parents abandoned him, he believed that his parents must have had a good reason for doing so. What did disturb him was the constant feeling that something was missing, as if someone took a part of him that cannot be replaced, like someone took his brother. This feeling caused the very young Gyūki to aspire to become a traveling mage. When he turned six years old he discovered that he wasn't capable of using magic. This caused the young Gyūki to become a target of teasing and bullying from the other children who can use magic. One day, when he was being bullied a certain crimson haired girl stood up for him and drove the bullies away. Just like Gyūki, this girl, called Otohime, was abandoned as a baby. Their similarities caused them to quickly become good friends.

Throughout his childhood, Otohime continued to stand up for Gyūki and drive the attackers away. However, on one fateful September morning when he was nine she said to him, "Who cares if you can't use magic that just means you have one less thing to focus on. Now stop being such a crybaby and stand up for yourself for once in your life because I won't protect you again. If you can't use magic, focus even more of your energy on the physical arts, become the greatest martial artist to ever exist. If you can't do that then you should stop trying, live your life normally like any other kid, and give up on your dream of finding your brother who may or may not even exist." It were these words that gave him the desire to become the greatest martial artist. A couple of months later Gyūki met a wise sage who was willing to teach him the secrets to the Tenshouaku Kenryu.

The training was very hard and he almost died on more than one occasion. Otohime's words did motivate him. The motivation seemed like to was only temporary. Luckily or perhaps unluckily, he found a new source of motivation to become the strongest martial artist a year later. The source of this motivation was the kidnapping of Otohime Dragonborn.

Ox Demon Physiology

 * Unrivaled Physical Prowess: Gyūki is famous throughout all of Earth Land and even outside of Earth Land for having the greatest physical prowess in existence. There are a lot of theories surrounding the source of his physical prowess, such as his unique magic power, but no conclusive evidence for these theories have been found. While all of his physical traits are on the same level, his most famous trait is his strength. Gyūki has enough strength to obliterate gigantic buildings with a nonchalant punch. His speed is great enough to no only make it look like he is teleporting, but give him the ability to appear to a desired destination instantaneously, regardless of how far away it is. Devil Slayers who fight Gyūki soon realize that Gyūki's durability is so great that Devil Slayer Magic barely harms Gyūki. Gyūki's durability makes blades virtually ineffective against Gyūki and Magic Barrier Particles barely harm Gyūki. If an opponent does manage to harm Gyūki, his endurance is great enough to allow him to keep fighting, even if he is on the verge of death. When combined with his incredible muscle memory, Gyūki is able to fight even when he is knocked out. A_fraction_of_Gyūki's_strength.gif
 * 100 Percent Muscle Usage:
 * Physical Prowess Manipulation:
 * Agelessness: Gyūki's physical prowess is so great that his body halted the processing of aging when he was 20: allowing him to be in his prime for his entire life. Unlike other beings who have similar abilities, this doesn't mean he doesn't have a lifespan, but rather is lifespan is greatly longer than most beings.
 * Regeneration:
 * Adoptive Muscle Memory:
 * Thermal Immunity:
 * Enhanced Senses:
 * Enhanced Combat:
 * Enhanced Combat Knowledge:
 * Martial Arts Intuition:
 * Body Language Analysis:
 * Combat Clairvoyance:
 * Pressure Point Intuition:
 * Unpredictability:

Tsuchi Power
Gyūki's magic power is a lot different from other mages and due to the difference, Gyūki's magic power is usually referred to as "Physical Energy" or "Tsuchi Power." This is mutation causes Gyūki's magic power to be influenced by his physical prowess, turning it into a manifestation his physical prowess. While Gyūki can use Tsuchi Power to perform long range feats as well as close range, he cannot use his Tsuchi Power to use Magic of any kind.
 * Tsuchi Power Manipulation:
 * Resonance:

Quotes

 * "It's so hard to find good martial artist these days." - Gyūki

Trivia

 * Gyūki is based off of a Japanese mythical demon with the same name.