General

• Galio's dance references Beauty and the Beast by Walt Disney.
• His previous alias, "The Sentinel's Sorrow", was replaced by "The Colossus" after his Champion Update.
  • He references his previous alias while attacking Blue Sentinel: "You're a sentinel? I'm a sentinel! We should fight!"
• Galio is seemingly short for Galileo, after the Renaissance Pisan polymath.
  • The name means "man of Galilee", ultimately from Semitic root g-l "circle."

Skins

 Classic Galio [S|L]

• A Demacian city known as High Silvermere can be seen in the background.

 Enchanted Galio [S|L]

• He might be referencing Chernabog from Fantasia by Walt Disney.

 Hextech Galio [S|L]

• He resembles The Iron Giant.
• He might be referencing 9 and/or Clank from Ratchet & Clank.
• In early concepts for his splashart,  Camille's leg was present and he was holding  Annie on his hands.
• He shares this theme with  Hextech Anivia [S|L],  Hextech Annie [S|L],  Hextech Janna [S|L],  Hextech Singed [S|L], and  Hextech Sion [S|L].

 Commando Galio [S|L]

• He references the Imperial Guard (specifically the Ogryn) from Warhammer 40,000.
• His outfit resembles Chris Redfield's from Resident Evil.
• He shares this theme with  Commando Garen [S|L],  Commando Jarvan IV [S|L],  Commando Lux [S|L] and  Commando Xin Zhao [S|L].

 Gatekeeper Galio [S|L]

• He resembles Illidan Stormrage from Warcraft, Hellboy from Dark Horse Comics, and a Bloodthirster from Warhammer 40,000.
• His bosses are  Little Devil Teemo [S|L] and  Kindred.
• He is the third non-comical Legendary skin, behind  Blood Lord Vladimir [S|L] and  Demonblade Tryndamere [S|L].
• His various interactions are references to the Nine Circles of Hell from Inferno.
• He shares this theme with  Ravenborn LeBlanc [S|L],  Little Devil Teemo [S|L],  Underworld Twisted Fate [S|L] (the runes on Galio's arms are the same as those on the back of his cards) and  Underworld Wukong [S|L].

 Debonair Galio [S|L]

• He celebrates Valentine's Day 2015 together with other Gargoyles (likely also created by Durand)
  • He is drinking what appears to be a  Mana Potion from a  Health Potion flask and holding a Coin from Mario.
• He might be referencing Vito Corleone from The Godfather.
• Him and the background seem to have been influenced by Art Deco.
• He shares this theme with  Debonair Ezreal [S|L],  Debonair Jayce [S|L], and  Debonair Vi [S|L].

Quotes

• "I came to chew bubblegun and kick butt, and I'm all out of butt." is a reference to the 1988 film They Live in which the main character, enters a bank with a pump-action shotgun and says "I have come here to chew bubblegum and kick ass, and I'm all out of bubblegum."
• He also reference Duke Nukem with the quote "It's time to kick ass and chew bubblegum and i'm all out of gum"

Relations

• It is uncertain how long ago Durand created Galio.
  • Considering he and  Poppy know each other, he is at most as old/older as/than the Kingdom of Demacia ever since its founding by  Orlon himself.
    • And given he and  Sion fought each other many times back when the Undead Juggernaut was alive, Galio (and by extension Durand) is at least a contemporary or Jarvan I's.
•  Galio sees  Lux as the only mage he likes, and has become a sort of Guardian to her.

References