Character: buck (spiritfarer)
Buck is a character in Spiritfarer videogame. His spirit's appearance is a basilisk (mythological_basilisk??) with yellow beak, dark-green head, and lighter-green winged body (slightly smaller than Stella_(spiritfarer)). Apparently was a human in life.
Spiritfarer wiki page about Buck: https://spiritfarer.fandom.com/wiki/Buck
This tag implicates spiritfarer (learn more).