Leo's appearance can vary, but his attire is comprised of a blue bandana, a white button-up shirt with elbow-length sleeves, an open sleeveless red vest containing gold buttons, black pants which are rolled up to his ankles, and black and blue sneakers. The version of Leo we see most advertised has fair skin, spiky blonde hair that curves down behind his head, and blue eyes. But, the other versions of Leo that can be selected in-game include him having black hair and slightly tanner skin with black eyes, red hair and tan skin with brown eyes, and dark brown hair with dark skin with dark brown eyes.
Leo always acts cool. He doesn't like to become close with people due to his past, but he gets along with people better than he's expect. He can be impulsive and easily irritated, but at the end of the day he is loyal to those he cares about.
Several years ago, Leo had a big argument with his best friend and has preferred being alone ever since. One day, he shows his dance moves to some children and becomes nervous that they won't like him.
- In the novel, "Balan Wonderworld ~Maestro of Mystery, Theatre of Wonders~," Leo enters Wonderworld and soon forgets his name. Until he remembers it with the help of Balan and Emma, he is referred to as "Streetbeat" by the other Inhabitants.
- People often compare his design to that of Sonic the Hedgehog, another character made by Yuji Naka and Naoto Ohshima. This is due to Leo's spiky hair that resembles Sonic's quills, and the use of the color blue throughout Leo's design matching Sonic's blue fur.