Winter is a Bisexual (often Femboy) Male, Shark-esq Aquatic Protogen, although he's mostly well known as Festive Winter -- which is his owner's screen-name .
Accordingly, all character's directly owned by Festive Winter use the Festive_X tag scheme.

Primary with a light blue, yellow/orange, royal purple, and white color scheme, but some appearances may omit the purple elements, as they're based off an earlier version of the character's design.
post #2938500 <- Yellow Variant | Purple Variant -> post #5500685
Anatomically; Winter has 4 ears, either metal/claw hands or pawpad hands, and a large finned (and half furred) aquatic tail. Despite his pawpads, claws, fins, tongue, and mouth being yellow, his flesh is otherwise a natural pink/red. This extends to NSFW where he does have a pink/flesh colored anus and knotted canine-style penis and sheath.

Festive Winter is taken, by his girlfriend, known online as BearThing404 or by their character Danni_(bearden), who's featured in some of his art.

Festive Winter's FA
Festive Winter's Bsky
Festive Winter's X / Twitter