The title character is a "weird little boy" who inhabits a world occupied by aliens, monsters, robots and other strange characters. According to Tatulli, he came up with the name "Lio" because he "wanted a simple name to go with the simple, wordless concept.
The protagonist is a "unique young boy" who resides in a world inhabited by aliens, monsters, robots, and other unusual beings. According to Tatulli, he chose the name "Lio" because he wanted a straightforward name that matched the simple, wordless concept.