He's a male veil tail! Very pretty.
I think his coloration is fine! It actually looks very nice in my opinion. :) Lots of bettas have that fade-out look on their bodies, they're just as healthy as the rest! There's only a need for concern if it looks fuzzy, has white "salt grains" across it, or looks like it's been sprinkled with gold matte glitter.
nice betta i have 12 6males 6females one dragon male 2male halfmoon 1delta tail and 2 bamboo all my females are bamnoo exept for my full moon one here are their names jay junior,jaws,sabestian,killer,sonic,shark,rose,sayl or,cutie,flikie,marion and abby