G.U.Y.S. (Guys Under Your Supervision) are a set of collectible toys in Beach City. They debuted in the episode "Onion Trade". They are sold at the G.U.Y.S. dispenser in the Funland Arcade. Ranger Guy is the rarest figurine, and Dave Guy is the most common one. Both Onion and Steven are collectors of G.U.Y.S., and G.A.L.S. and B.O.Y.S. exist as spinoffs.
- Apple Guy
- Cat Guy
- Chocolate Guy
- Construction Guy
- Cop Guy
- Dave Guy
- Eye Guy
- Invisible Guy
- Jagged Guy
- Lady Guy
- Ninja Guy
- red variant
- Ranger Guy
Steven recalls memories of a day with his father who won a G.U.Y.S. toy for him. Steven's favorite character is Ranger Guy; he states that it is his favorite mostly due to the memories attached to it rather than because of the toy itself.
- When Steven inserted multiple coins to get another Ranger Guy, the machine kept giving him Dave Guy until it ran out of G.U.Y.S.
- According to Steven, Dave Guy is an accountant who enjoys doing taxes.
- Ranger Guy used to be a doctor, as stated by Steven.
- Steven also owns Ninja Guy and Construction Guy.
- G.A.L.S. are the female counterparts of G.U.Y.S., as seen in "Onion Friend".
- As shown in the same episode, Onion owns an Invisible Guy container, that appears to be, comically, an empty container.
- Onion also owns a rare red variant of Ninja Guy.
- According to Matt Burnett, G.U.Y.S. are trendy collectibles from the eighties, currently back in production as part of an 80s nostalgia wave.
- The G.U.Y.S. (Guys Under Your Supervision) toy line of rubber figures may be a reference to M.U.S.C.L.E. (Millions of Unusual Small Creatures Lurking Everywhere), a similar toy line based on the Kinnikuman manga.
- As with G.U.Y.S. and its spinoff of "G.A.L.S.", M.U.S.C.L.E. also had a female-based spinoff line known as "C.U.T.I.E."
- The G.U.Y.S. icon positioning (with Steven's head in the center) may be a reference to Mega Man (specifically the Mega Man 3 stage select).
- Dave Guy might be a reference to Dave Strider from the webcomic Homestuck. They both have use the color red, have blond hair, and at one point Dave Strider says, "Maybe I'd rather just be like, Dave of Guy. You know, just some dude".
- Also, Strider's time travel abilities mean there are often many of him existing simultaneously, just as Dave Guy is so common.
- Eye Guy shares his name with one of the alien forms of Ben Tennyson from the Ben 10 franchise, as well as a monster from the early days of Mighty Morphin Power Rangers.
- Steven marks his toys' feet with his initials, similar to Andy in the 1995 animated Disney/Pixar movie Toy Story.