Crab Spirit

Crab Spirit (タラバガニの精霊) is the spirit of a red king crab and the Guardian Ghost of Kouji Yamada.

About
Apparently, he got along well with Damayaji because his hairstyle looked like a hermit crab. After Damayaji's death, both went to the afterlife together rather quickly.

Anime/Manga Difference
In the 2001 anime series, Yamada has the Centipede Spirit instead of the Crab Spirit.