Twilight Sky shares his mane and tail designs and sometimes pony kind with Star Hunter and "Cosmic", shares only his mane and tail designs with Neon Lights, Dark Moon, "Flank Sinatra", S02E26 Unnamed Unicorn Stallion #1, S02E26 Unnamed Unicorn Stallion #2, and sometimes the unicorn version of Shooting Star, and shares his cutie mark and sometimes tail design with "Sir Pony Moore".