Siobhan has short blond hair with an asymmetric cut, longer on the right. Her left ear wears a golden earring. Her pupils are greenish blue. She wears masculine outfits: a red jacket with a black belt on the right sleeve, a dark-blue flower-patterned outer shirt, an even darker inner shirt, black bands on her right wrist, a purple plaid necktie, a black choker, a golden flower-shaped necklace, and gray trousers with a purple rope on the right. Her outer shirt hangs a pair of sunglasses.