Gororo

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

About
He is a Koropokkuru. Because of his unnatural size, he has been shunned by the other Koropokkurus.

When Kurobe Tamiko died in the mountains and refused to leave this world Gororo appeared before her. 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 series, Gororo didn't either.