Nathan Kosei

**Nathan Kosei** (ネイサンコーセイ, *Kōsei Neisan*) was a Makai Knight with the ablity to transform into **Zen the Flame Sword Knight**. He's also the younger brother of Kalia Kosei and the older brother of Anita and Merritt Kosei.

## Backstory

### History

Nathan was born as the second oldest of four in the Kosei family. His father was a police officer, and his mother was a housewife. Nathan while growing up has always looked up to his older sister, Kalia, who despite being soft she would be responsible, and the more reasonable one of the four. He would also always want to become a police officer, and help others. That was until one day, when he was in middle school, Nathan and Kalia would be walking back from home when they were suddenly jumped by two weird monsters. The kids, scared of the monsters, would run away from the two, but not for long as the monsters would catch up to the two, and beat them up to the point where the kids fainted, but right before they fainted they saw a person in red armor attacking the monsters. A few hours later, Nathan woke up in his room as he would be bandaged up and his mom looked at him with a stare of relief and hugged him.

When he asked about the monsters, the person in red and Kalia, the mother would sigh, and give him a sad look as she would leave for a few minutes and come back with a red Liuyedao, and a lighter. The women would tell Nathan that those monsters were known as Horrors, Demon-like creatures that come from another world that feeds on humans, and that she’s what’s known as a Makai Knight, people who fight the Horrors. Nathan would listen to his mom as he would ask the woman about Kalia again, getting worried about his sister. The mother would be quiet as she told him that she was unable to protect Kalia from getting taken from the Horrors. Nathan would be depressed that there was a chance that he would never see his sister again, and then gained a hatred of Horrors. Nathan would try to convince his mother to allow him to become a Makai Knight, so that he can try to find his sister, and beat the Horrors for taking her, only for the woman to say no since being a Makai Knight was dangerous and she didn’t want another one of her kids to be taken from her.

So for the days after Kalia being taken from them, and Nathan resting, the boy would continue to try and convince his mother to train him to become a Makai Knight, but those times all ended with the lady saying no. On the last day that he was in bed before he could start walking, Nathan, like the last few times, would try to convince her, but unlike the last few times the mother, tired of him asking, would finally train him to be a Makai Knight, but he had to be serious about this since being one can be dangerous. The Boy would be happy that his mother would allow him to be a Makai Knight as the woman would smile and say that his training would start tomorrow. So for 10 years, the Mother would train her son everything that she knows about being a Makai knight, from learning that some humans are actually Horrors in disguise which is why they use Lighters that create green flames to find them to the 2 types of Horrors, Inga and Mado, to learning about Blazing Armament. When Nathan turned 21 years old, he would've finished his training of being a Makai Knight as he would be given his Mother’s Makai Sword, Flaming Scimitar, becoming the owner of the Zen armor. Nathan would travel around to find his sister, and destroy Horrors as he would stop at Japan, since he saw many Horrors there. The boy would then join a business that basically does random jobs as he would now look around to find his sister.

### Death

During a battle with Akyanba, the Kyuranger villain threw her staff at Nathan's arm, completely chopping it off. The attack caused his suit to fade off of his body as he laid on the ground until Tamaki and Kyoko ran over. Although the two tried to help, it ended with Nathan bleeding to death, his body going limp.

### Legacy

The Zen armor was then given to Satoshi after Nathan's death. Nathan's jacket and previous sword were then buried in a special Makai Knight grave in an unknown cemetery.

## Personality

When it comes to Horrors, Nathan is shown to be serious, and focuses on his job to stop and destroy them. That is due to the fact that Horror looks like humans, and when he fights them in public it can look like he’s the bad guy. Outside of fighting Horrors this boy is an extroverted, and social person that likes to talk to people. Nathan is also shown to be sometimes responsible and reasonable.

## Abilities

* **Makai Knight Training**: Because of being trained by his mother for ten years, Nathan has a basic understanding of being a Makai Knight.

## Equipment

* **Zen Sword**: Nathan's broadsword is based on the designs of a Chinese *Liuyedao.* True to its namesake *Flaming Sword*, the Makai Blade designed for deploying much devastating Blazing Armament through Zen armor's ability to compress Madō Flames.
	+ **Zen Armor**: As a Makai Knight, Nathan is given the title of The Flaming Sword Knight. As such, he has the ability to don the red Zen Armor with his Zen Sword. Nathan does this by slamming his sword on the ground and drawing a large circle around him. The large circle opens a portal where the armor ascends and equips on him, completing the transformation.

## Zen

*Main article: Zen*
**Zen the Flame Sword Knight**

**Skills & Abilities**

* **Sword Proficiency:** Zen is an armor specialized in sword combat, thus improves the wearer's skill with such weapon.

**Tools & Equipment**

* **Flaming Scimitar:** Zen's Makai Blade which fashioned into liuyedao in its normal form and assumes more ornate, two-handed version of itself. Nathan transforms by slamming his sword to the ground and drawing a large circle around him, opening a portal beneath his feet from which the Armor equips him, completing his transformation.

* **Madō Lighter:** To expose Horrors and assisting in performing Blazing Armament.

## Notes

* Nathan is the first OC in AHW to have their arm completely cut off.
	+ Technically, he is the first **human** OC to have their arm cut off, as Feidhelm has had her limbs cut off multiple times. (but she always got repaired)