Animal look in orange and dark grey, based on Pyro. Fits the classic model in Minecraft Java - download the PNG and set it in the launcher.
Free, and nothing to sign up for.
Twisted Shrimpo
Orange Blob
Pyro With Cosmetics
Voiddude29 Pyro Edition
Winter Pyro
Pyro Cosmetic Loadout
Pyro Skin
Pyro TF2