Rin

Rin is a little girl who is accompanies Sesshomaru. Her name means "companion" in japanese, which possibly refurs to the fact that she's always besides Sesshomaru. After Sesshoumaru fights InuYasha and got hurt, Rin takes care of him. After that, a crew of wolfs (commanded by Koga) enter her village and kill everyone, even Rin. When Sesshomaru discovers Rin's body lying on the ground, he decides to use Tenseiga to make Rin return to life. Since then Rin will always go after Sesshoumaru. The relationship between Rin and Jaken, the other member of Sesshoumaru's crew, is like the one of the big brother (Jaken) who is always jealous of Rin due to her being on the seemingly favored side of Sesshomaru.

The most important thing about Rin is that she is the only human of whom Sesshoumaru seems to like. On the last episodes Rin is left in a village with other humans, but she finally goes with her heart and returns to Sesshoumaru's side and protection. In the manga, Rin is dead once again (due to her being sucked into the pits of hell) and cannot be revived by the Tenseiga (due to the Tenseiga having the ability to only revive humans once.) Sesshomaru was heartbroken when he couldn't revive Rin.Sesshomaru's mother is then seen reviving her.

In the final chapter of the manga, set three years after the defeat of Naraku, Rin no longer travels with Sesshomaru and Jaken. Instead, she lives with Kaede, which InuYasha comments is "practice" for her to live in a human village as an adult, or whatever life she chooses. Sesshomaru is shown visiting her and bringing her gifts.