Gooigi: the goo double who backs up Luigi
1110 words | Reading time : 5 minute(s)
CharacterLuigi's MansionProfessor E. Gadd
A Luigi made of green jelly, able to pass straight through iron gates. Straight out of Professor E. Gadd's laboratory, Gooigi slips between bars, strolls over spikes and squeezes into pipes — but the smallest puddle dissolves him. This profile traces his little-known debut in the 2018 3DS remake, his origins as an idea first designed for Luigi's Mansion 3, and his role as the backbone of the co-op mode in Luigi's Mansion 3.
Green, translucent and dripping, Gooigi (Gluigi in French) is arguably the strangest sidekick ever handed to a Nintendo hero: a Luigi double made entirely of goo, able to go where the original simply can't.
Invented by Professor E. Gadd, this jelly-like clone has become the cornerstone of Luigi's Mansion 3 and the key to its two-player mode. Portrait of a gloriously slimy stroke of genius.
Contents
- An invention of Professor E. Gadd
- A 3DS debut before the fame
- Through gates, over spikes: his superpowers
- The backbone of Luigi's Mansion 3
- A melting mascot adopted by the fans
- Quick facts
- FAQ
An invention of Professor E. Gadd
Like the Poltergust vacuum, Gooigi comes straight out of the laboratory of Professor E. Gadd, the mad inventor who specialises in ghosts. While studying a mysterious slimy green substance, the scientist devised an astonishing process: moulding that goo into Luigi's likeness to create a fully operational double, complete with his own replica vacuum.
The result is unsettling: same silhouette, same cap, same moustache — except that the whole thing is translucent, green and wobbling like jelly. A dessert-trolley Luigi, with the powers of a wall-crosser.
A 3DS debut before the fame
Contrary to a widespread belief, Gooigi wasn't born on Switch: he makes his debut in the 3DS remake of the first Luigi's Mansion, released in 2018, where he lets you replay the mansion adventure in co-op.
A tasty development anecdote: Gooigi was first dreamed up for Luigi's Mansion 3 and its two-player mode on Switch, before being unveiled ahead of time in the 3DS remake. The developers even recall that the original idea was to make the ghosts — rather than Luigi — out of that jelly-like material. In French, the resulting pun is crystal clear: glu + Luigi = Gluigi.
Through gates, over spikes: his superpowers
Everything that makes Gooigi useful comes down to what he is made of. Where Luigi is stopped, the goo gets through:
- He passes through gates and bars by liquefying himself, to explore sealed-off areas.
- He walks over spikes and other floor traps without a single scratch.
- He slips into the pipes to resurface at the other end of a room.
The flip side: his kryptonite is about as mundane as it gets — water. The tiniest puddle dissolves him instantly, sending him sheepishly back into his tank. A water-soluble superhero: now that commands respect.
The backbone of Luigi's Mansion 3
It is in Luigi's Mansion 3 (2019) that Gooigi becomes indispensable. Luigi carries him in the tank on his back and can swap places with him at any moment: dozens of puzzles in the haunted hotel require you to juggle the two bodies, one holding a mechanism in place while the other pushes ahead.
Above all, Gooigi is the key to the two-player mode: a second player can take control of him at any time, turning the ghost hunt into a full co-op adventure, vacuum against vacuum. There the goo double earns his stripes as a co-hero in his own right, alongside his model, the eternal hero in the shadows.
A melting mascot adopted by the fans
With his giant-sweet look and his wobbly walk, Gooigi instantly won over the community: memes, figurines and fan art have made him one of the surprise mascots of the Switch. He perfectly embodies the humour of the Luigi's Mansion series: an absurd concept — cloning the resident scaredy-cat in jelly form — carried out with impeccable scientific seriousness.
The Polterpup starts out as a little pest — stealing keys and precious objects and darting off through the walls — before becoming the bodyguard who pulls Luigi out of King Boo's trap.
Ever since, fans have watched out for every appearance of the professor and his green goo: the melting double has become, in his own way, an official member of the Mario family.
Gooigi at a glance
| French name | Gluigi |
| English name | Gooigi |
| Creator | Professor E. Gadd |
| First appearance | Luigi's Mansion (3DS remake, 2018) |
| Major role | Luigi's Mansion 3 (2019) |
| Powers | Passes through gates and spikes, travels via the pipes |
| Weakness | Water, which dissolves him instantly |
| Specialty | Two-player co-op mode |
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FAQ
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Who created Gooigi?Professor E. Gadd, the mad inventor of the Luigi's Mansion series, designed him by moulding a slimy green substance into Luigi's likeness.
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In which game does Gooigi first appear?In the 3DS remake of Luigi's Mansion, released in 2018, before he became a cornerstone of the gameplay in Luigi's Mansion 3 on Switch.
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What are Gooigi's powers?He passes through gates, walks over spikes without taking damage and slips into pipes, which lets him reach areas off limits to Luigi.
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What is Gooigi's weakness?Water: the slightest contact with a puddle dissolves him instantly and sends him back into his tank.
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Can you play as Gooigi in two-player?Yes. In Luigi's Mansion 3, a second player can take control of Gooigi at any time to play through the whole adventure in co-op.