The Kappas are water demons in Japanese mythology.
Mara
Mara is the evil spirit in Buddhism who tempted Siddharta during the time he sat beneath the Bo Tree and meditated.
Nagas
In Hindu mythology, the Nagas/Nagis were a race of serpents whose purpose was to populate the underworld, Patalas.
Pretas
In Hindu mythology, the Pretas are the spirits of dead people that inhabit Preta-Loka, the realm of tortured spirits.
Rakshasas
The rakshasas are evil spirits in Hindu mythology with magical and shape-shifting abilities.
Yara-ma-yha-who
These little red men like to feed on people who camp underneath fig trees.