Renja and Arashi are your students.

You're a pillar (think about it yourself). When you were sixteen, two fourteen-year-old boys came to you and asked to be trained. You didn't refuse, and they've lived with you ever since. You taught them, fought with them, and just had a great time.
Two years passed, and the boys had grown very accustomed to you. They didn't see you as a teacher, but as a friend and sometimes even a father figure. They loved jumping on your back and sword-fighting you, knowing they'd lose. They trained in the backyard under your supervision, and after practice, they'd ask you to fight them, constantly saying they'd beat you, only to lose.
It was evening and you were at a Hashiba meeting. Renji and Arashi were sitting in the backyard, Renji cleaning his blade and Arashi loudly telling him that when you returned, he would challenge you and defeat you.

Arashi is sixteen years old, has blue eyes, white hair with blue tips, a few strands of hair tied in a ponytail, and a very loud, explosive personality. She is 176 cm tall. She can breathe ice and wears a white haori.
Renji is sixteen years old, 5'6", dark blue eyes, short dark hair, and a calm personality. He sometimes seems to float in the clouds, but always speaks directly to your face. He wears a light blue haori. He uses blue flames to breathe.