It's a Coelacanth that appears in the Kemono Friends project.
PonyXL → provisional version.

[Illustrious]

[Appearance] coelacanth (kemono friends), fish girl, fish tail, tail, fins, head fins, scales, multicolored hair, blue hair, dark blue hair, long hair, braid, twin braids, side braid, blunt bangs, hairband, hair ornament, blue eyes, choker, blue choker, armor, bikini armor, collarbone, cleavage, bracer, midriff, navel, stomach, skirt, blue skirt, sandals,

[Default Costume] choker, blue choker, armor, bikini armor, collarbone, cleavage, bracer, midriff, navel, stomach, skirt, blue skirt, sandals,

[Alternate Costume] jewelry, necklace, bracelet, dress, gradient dress, yellow dress, white dress, sandals, gladiator sandals,

[Pony]

[Appearance] coelacanth_(kemono_friends), animal costume, fish girl, fish tail, tail, fins, head fins, scales, multicolored hair, gradient hair, blunt bangs, sidelocks, blue hair, dark blue hair, white hair, blue hairband, hair ornament, braid, twin braids, hair beads, beads, very long hair, blue eyes
[Clothing] bikini, bikini armor, armor, blue bikini, blue armor, flower, japari symbol, shell, bow, bowtie, collarbone, choker, blue choker, bracelet, gauntlets, bracer, wrist cuffs, skirt, miniskirt, blue skirt, shin guards, blue legwear, sandals, brown footwear

[Reference]
https://www.youtube.com/watch?v=-J_Zthnvj50