Theo Cornaro is the male protagonist and the main character of Grancrest Senki. He possesses a crest (which signifies nobility and gives superhuman powers) he received through defeating a monster, whereas normally you have to get one through transfer from another crest-holder. He has an ideal to bring peace to the land, which Siluca vows to support him in achieving. Later on Theo meets new people along the way and faces many new problems and events.