Gooigi

"Allow me to introduce this green doppelgänger. I call him Gooigi!"

- Professor E. Gadd

Gooigi is a clone of Luigi featured in the Nintendo 3DS remake of Luigi's Mansion. He appears in Luigi's image, but is entirely composed of green goo, hence his name, and wields a gooey version of the Poltergust 3000.

Sometime in Luigi's Mansion: Dark Moon, Professor E. Gadd created Gooigi, and sent him back in time to the events of the original Luigi's Mansion, outsourcing his testing to Luigi and his past self.

In the game, Gooigi's primary purpose is to serve as the second player in the game's new multiplayer mode. He's vulnerable to fire, burning and melting very easily, but can revive indefinitely if defeated. When Gooigi's not being played with, he's seen in the background of The Lab staring at some test tubes.