Rin

Rin, a young human girl, was orphaned and left to fend for herself in her village. Sesshoumaru came across her and brought her back to life with his Tensaiga. Now Rin travels with Sesshoumaru everywhere.

Red & White Priestesses

The Red & White Priestesses are two young girls that were tricked by Tsubaki, the Dark Priestess, into thinking that Inuyasha and his friend were evil demons. The two girls fought against Inuyasha and the gang until the understood that they had been decived by Tsubaki.

Ryukotsusei

Ryukotsusei is large dragon-like demon that was an enemy of Inuyasha's father. Inuyasha had to defeat him in order to strengthen his Tetsusaiga and make it lighter for him to handle.