Candraprabha Bodhisattva, or Gakkō Bosatsu in Japanese, (Japanese: 月光菩薩) is a bodhisattva

Bodhisattva

In Buddhism, a bodhisattva is either an enlightened existence or an enlightenment-being or, given the variant Sanskrit spelling satva rather than sattva, "heroic-minded one for enlightenment ." The Pali term has sometimes been translated as "wisdom-being," although in modern publications, and...

 often seen with Nikkō Bosatsu

Nikko bosatsu

Suryaprabha Bodhisattva, or Nikkō Bosatsu in Japanese, is a bodhisattva whose specialty is sunlight and good health. Nikkō is often seen with Gakkō Bosatsu , as the two siblings serve Yakushi or the Medicine Buddha...

 (Sunlight), as the two siblings serve Yakushi

Bhaisajyaguru

Bhaiṣajyaguru , formally Bhaiṣajyaguruvaidūryaprabharāja , is the buddha of healing and medicine in Mahāyāna Buddhism. Commonly referred to as the "Medicine Buddha", he is described as a doctor who cures suffering using the medicine of his teachings.-Origin:...

 or the Medicine Buddha. Statues of Nikkō and Gakko closely resemble each other and are commonly found together, sometimes flanking temple doors. They are also known in mainland Asia, but as devas

Deva (Buddhism)

A deva in Buddhism is one of many different types of non-human beings who share the characteristics of being more powerful, longer-lived, and, in general, living more contentedly than the average human being....

rather than bodhisattvas.