Oh man, I loooooove artists that can blend pony and other properties really well like that. So many people mess it up, but when it's done right? It's actually pretty cool. I've seen really cool stuff done with pony and Metroid of all things.
And yes, if anyone's curious, there is Splatoon pony art out there.
TBH, if I ever get around to making a little mascot for my art, it'd probably be a cat, because the username I use or my art (MooMew64) is partly inspired by cats. The "Moo" comes from cows, because for whatever reason I had cows from Harvest Moon on my mind at the time, and the "Mew" comes from a cat meowing and one of my favorite Mythical Pokemon, Mew. The 64 wasn't supposed to be there, but I had to put it there because just MooMew would be taken no matter where I'd go. The 64 comes from the N64, which is where I started gaming as a young lad.