Theo is the main protagonist and the grandson of Guardian Purple. A heroic, yet stubborn, 13-year-old who grows less selfish as the series progresses. Despite being related to Guardian Purple, he is completely unaware of the seven food groups until the first episode of the series, and remains in the dark about much of the conflict. He is heavily implied to have feelings for Lena, and responds with anger and jealousy when he believes she has feelings for Sid.
- Dr. Rodney Rathbone (LEGO Monster Fighters)
- Jack Skellington (Nightmare Before Christmas)
- Kermit the Frog (Muppets)
- Johnny Thunder (Orient Expedition)
- Elliott (E.T. the Extra Terrestrial)