Garamaru is a fictional character in the anime series Inuyasha, in episode 100 The Truth Behind the Nightmare: Battle in the Forest of Sorrow
The Inuyasha gang first meets with Garamaru when they enter the illusory woods of the Forest of Sorrow. At first he sends in a swarm of moth demons to attack Inuyasha and his friends, but then decides to make a personal appearance. Garamaru reveals he is Gatenmaru's brother, but has no desire to avenge him, seeing as he led a band of human bandits. He traps Kagome, Shippo, Sango, and Miroku inside cocoons in which they slowly turn into moth demons as they dream nightmares. Inuyasha is enraged and does battle with Garamaru, who rubs Inuyasha's fear of being alone in his face. After a brief duel Garamaru transforms into his true self, a yellow moth demon, which Inuyasha then easily dispatches with his Kaze no Kizu. His appearance in his friends dreams after killing Garamaru stops them from becoming moth demons.
Garamaru's name possibly means "Moth Guardian Man", or "Moth Devil Man", which would contrast his name with his brother's.