Jaken

Jaken (邪見, Ja Ken) is a small green imp-like yōkai who is extremely loyal to Sesshomaru, often praising his master's greatness.

Jaken himself is not especially powerful, despite bearing a weapon known as the Jintou Tsue (人頭杖, Staff of Two Heads). He seldom engages in battle and is actually killed by Kaijinbo with Tōkijin, but Sesshomaru resurrects him with Tenseiga.

Biography
In the first part of the InuYasha's story, Jaken uses his staff of 2 heads to find InuYasha's and Sesshomaru's father Graves. Then later on in the story, he had began a merely a comic relief having little or almost hardly any role in the story.

Relationships

 * Relationship between Jaken and Rin

At first Jaken disliked Rin as she was a human. However, as time went by he began to treat her better. Jaken sometime acts as if he hates her, but in truth he doesn't want Rin to get hurt and whenever there's trouble, Jaken always tells Sesshomaru to save her.


 * Relationship between Jaken and Sesshomaru

Jaken respect Sesshomaru and always praises Sesshomaru whenever he defeats a demon, much to Sesshomaru's annoyance. Jaken always sticks by Sesshomaru side even when times of danger.

Jaken and Inu Yasha have a very bitter relationship. Despite the number of times Inuyasha has saved him, he always turns against him due to the conflict between Inuyasha and Sesshoumaru.
 * Relationship between Jaken and Inu Yasha

Anime/Manga Difference

 * The manga explains little about Jaken's past, but the anime shows that Jaken was once a lord among similar demons. During battle with another Yōkai tribe, the enemy leader had Jaken by his neck when Sesshomaru appeared and told the demon to move out of his path. When this was not obeyed, he calmly destroyed the Yōkai with his poison whip. Out of a sense of obligation, Jaken followed Sesshomaru, who allowed him to become a servant if he could use the Staff of Two Heads.