Mimisenri

is a demon who has very good hearing, and tells Naraku the location of the final shard of the Shikon no Tama.

During the story
When Naraku appears before Mimisenri, the large eared demon asks if Naraku plans to absorb him into his body so that he can hear things extraordinarily well too, but Naraku replies he has no interest in absorbing a filthy body such as his. Mimisenri hears Naraku coming from "four miles away" and asks if he's seeking information on the Shikon shards, hearing from numerous demons that Naraku has gathered most of them. Naraku corrects him and says there is only one shard left he cannot find, so Mimsenri strains his ears, listening for rumors on the jewel, and tells Naraku that the final shard is in the Borderland between this world and the afterlife. This is how the hunt for the final shard begins.

Powers & Abilities
Mimisenri has the ability to hear everything that happens in the world, even under water, and possesses great wisdom because of this.

Trivia

 * For some reason in the English dub of the Anime in the very first episode, he appeared in Episode 127: Don't Boil it! The Terrifying Dried up Demon with his first debut on screen with Naraku and spoke to him. Naraku addressed him with the wrong name and called him "Mimisendi" instead of the correct "Mimisenri". It is possible that it is less correct by saying "Mimisendi", but it is hard to tell in that particular part of the speech.
 * For some strange reason, Mimisenri appears along with Naraku and his minions in the opening "One Day, One Dream", despite only having a minor connection to him.
 * Mimisneri's name and his ability resembles to two character from the Chinese mythology; his name is the combination of  (adapted from 順風耳 ', "With the wind ear") and (adapted from 千里眼 ', "Thousand miles eye"), his ability is the same as the Shunfeng Er.

Mimisenri Mimisenri 顺风耳