- Gekko's signature color is green.
- Catboy tends to treat Gekko like his little brother.
- Greg can tend to get dizzy easily, as seen in "Catboy's Tricky Ticket" and "Clumsy Catboy".
- He owns a pet lizard named Lionel.
- In "Owlette of a Kind", he temporarily gained Owlette's powers due to Romeo's Power Copier.
- He was also the temporary leader of the PJ Masks for that episode.
- He has the most catchphrases out of the PJ Masks. His catchphrases are:
- "Leaping Lizards"
- "Gasping Gekkos"
- "Slithering Serpents"
- "Easy-peasy Lizard-squeasy"
- "Cool Chameleons"
- In "Catboy's Cuddly" and "Moon Cuddly", it is revealed that he has a cuddly lizard named Lionel Jr.
- Gekko gains a new power, Super Gekko Shields, in "PJ Power Up".
- Gekko seems to like desserts in "Soccer Ninjalinos", "Owlette's Luna Trouble", and "Easter Wolfies".
- In "Easter Wolfies", Gekko is shown to like chocolate.
- Gekko is based on the original book series character, Gluglu.
- He is called that name in the French version of the series.
- He has a habit of thinking that the villains might’ve changed from bad to good without considering that it could be a trick, as shown in "Catboy and the Lunar Dome" and "Gekko and the Opposite Ray."
- In the episode "Do The Gekko", he is shown to be good at dancing.
- He is an expert at catching people in his arms when they fall.
- In fact, Gekko is the only PJ Mask who does most of the catching.
- In "PJ Robot Takes Control", he plays Fortnite's "The Floss" dance, along with PJ Robot.
- In "Big Sister Motsuki," he gets zapped by the baby beam for the first time.
- In Seasons 2 and 3, his voice is noticeably lower-pitched than in Season 1 and Season 4 onward.
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