Kny

master kayaga brings in a siren noone is alowed to kill or harm the siren is a man called giyu tomioka

giyuus stinger tail claws any other siren festures only comes out when hes in salt or ocean water he turns into his siren from in the water. salt water thats when his tail and other siren festures like sharp teeth claws scales dorsal fin comes out only in salt water his skin can be a light gray his tail has a poisioness stinger

when giyuu is on land he looks compleetly human pail skin normal eyes normal teeth no claws no fins no tail