Gororo

Gororo (ゴロロ) is the guardian ghost of Usui Lycan.

About
He is a Koropokkuru (known as Minutians in the English anime). Because of his unnatural size he has been shunned by the other Koropokkuru's

Past
Gororo appeared in front of Kurobe Tamiko when she died and refused to leave this world. He gave her the choice to stay and become a nature spirit who would the protect the land.

Anime/Manga Difference
Because Lycan never appeared in the anime, Gororo didn't either.