- Gekko's signature color is green.
- Catboy tends to treat Gekko like his little brother, as shown in "Looking After Gekko."
- Greg can tend to get dizzy easily, as seen in "Catboy's Tricky Ticket," "Clumsy Catboy," and "Master of the Moat."
- 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.
- Gekko is the only PJ Masks member to be a giant, this happening in "Super-Sized Gekko."
- 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"
- "Wriggling Reptiles"
- "Reeking Reptiles"
- 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 "Wacky Floats."
- The shields are inspired from the iconic shield owned by Captain America, a Marvel superhero.
- 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.
- This episode also reveals that Gekko loves 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 performs 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.
- Gekko's costume and powers is a combination of Gluglu's standard costume and his designs are inspired from the Marvel supervillain, Lizard.
- In "Who Let the Moths In?," Gekko seems to have a big appetite when he was eyeing the pizza box.
- Gekko sometimes tries to be the peacemaker whenever an argument is being started, but he usually gets interrupted and he decides to let it go on.
- Unlike Gluglu, Gekko doesn't have the ability to breathe underwater as his book counterpart.
- Instead, he is required a spacesuit to breathe underwater.
- He is revealed to have a lucky button in "Catboy's Magic Trick."
- "An Yu's Birthday" is the first time he was not shown in the daytime.
- In "Heroes Everywhere," when the heroes respective colored beams head into space to form the headquarters, he could be seen coming from central Florida in the United States, meaning the city is located somewhere in the southeast region of that country.
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