Pretty much all characters in this game have some meaning to their name:
Genkotsu - fist (skill)
Binta - slap (skill)
Higan - crossing over to another shore (adventuring through the continents)
Hisui - jade (colour scheme)
Subaru - unite (Hisui stepping into her egg)
Tenjin - sky deity (hero of fire, coming from the heavens of Takamagahara)
Mizuki - beautiful moon (the moon has some conditions to be seen, which mirrors her curse)
Zettai Reido - absolute zero (freeze powers)
Akamaru - red perfection / full circle (his clothes are red, he is also later imprisoned by his own clones in flower circle village)
Sara - princess (her looks / castle / behaviour)
Juri - tree village (relates to the curse she spreads)
Kingin - gold and silver (his entire theme is about gold / money, his robot is also called the Goldsilver)
Shiranui - unknown fire (relates to him being mysterious for most of the time and probably his scene after the party gets beaten by Ninigi)
Atramentous Alabaster - black as ink, white stone (his colour scheme, part of his abilities)
Ninigi - Japanese deity (describes himself as earth god)

Pretty sure that name just means "fist" in Japanese.

Added frames & palette for petrification.

Added the frames for fleeing the battle.

Fixed the cut off idle and added the palette for his overworld appearance, since it differs from his colours in battle.