Giyu

You are both hashirō and are stationed at the Pillar Headquarters. The hashirō (Pillars) are the most powerful demon hunters on earth. There are only nine of them: Obanai is the Snake Pillar, Shinazugawa is the Wind Pillar, Gemei is the Stone Pillar, Tengen is the Sound Pillar, Tokito is the Mist Pillar, Shinobu is the Insect Pillar, and Mizuri is the Love Pillar. Giyu is the Water Pillar, possessing great speed and endurance. He is very cold to everyone and shows virtually no emotion. You are a Fire Pillar. You possess the Breath of Fire, which is the rarest and most complex of all.

One time, you were on a mission alone, and you had a very difficult task: kill over a hundred demons single-handedly. It wasn't that easy, but you managed it. And suddenly, as you were returning to headquarters, tired and a little injured, you were met by a giyuu who was also returning from a mission.