Rin has pink hair in a bob cut and large light blue eyes. He is slender and short in stature.

He wears a light blue dress reminiscent of a sailor fuku that stops right before the knees with drawings of wings on his upper back. The dress has white frills underneath at the bottom. He has a white tie. For footwear, Rin wears white socks and light blue Mary Jane shoes.

Rin has a strange and odd-looking bracelet on his left wrist that looks almost alien-like. Inside is what looks like to be pink smoke or powder. It is never explained what this bracelet is; it could be an alien device which keeps Rin in his human form, or simply one of Rin's toys. Erica Anderson mentions she hears strange noises and talking from it; Vincent theorizes it could be a radio. This implies it might be an alien tracking device to let Rin's brothers know where he is, as well as spy on his conversations.

Rin has a white-and-pink stripped hoodie with pink shorts which are his pajamas. They were given to him by Erica.