I've already made the unicorn models I just can't figure out what script I should use so that the players spawn with the body of the model unicorn I made.
Look at the two comments on your question, they're right; make a valid model of a unicorn while somehow including all parts of a roblox character (HumanoidRootPart, Torso, Legs and Arms, etc) I THINK; correct me if i'm wrong, then put that in StarterPlayer and name it StarterCharacter.