In addition to Liō, the strip only has one other major character, Liō's unnamed father. He is frequently shown to be the subject of Liō's pranks, and sometimes he has to get his son out of difficult situations. When he watched a news report of an alien invasion, he gave Liō a spanking for apparently having piloted the alien ship and parking it in the backyard. On the other hand, one day when the boy came home from school dejected because a drawing he created had horrified the faculty, Dad proudly hung up the piece of art on the refrigerator, giving his son much-needed comfort and joy. Quite often, father and son prove that they really love each other, no matter what.