Hagiri

was a friend of Tenma Izumo during their time in Konohagakure's Academy.

Background
Hagiri's mother and sister died during the Nine-Tailed Demon Fox's Attack while he watched helplessly. Because many believed the attack to have been the doing of an Uchiha, Hagiri joined Tenma and Katsura in bullying Itachi Uchiha. Despite being much younger than all of them, Itachi easily defeated them once a fight broke out.

Trivia

 * Written as 歯切り, "Hagiri" means "gnashing the teeth," which could allude to both his bullying nature and his grudge against Itachi.