| Character Information
| Name || Jeffy
| Gender || Male
| Franchise || Super Mario Logan
| Weapons/Accessories || *Pencil
| Vehicles and/or Gadgets || Cat Piano
| Residence || Mario's Apartment
- “What doing?”
- — Jeffy's first line when entering the game
- — Jeffy's second line when entering the game
- “Hi, my name is Jeffy. See, it says it on my shirt "Je-ffy".”
- — Jeffy's third line when entering the game
is a Super Mario Logan
character in LEGO Dimensions.
- Super Strength (Helmet)
- Draw (Doodle Doodle Pencil Fart)
- Sonar Smash (Crying)
- Silver LEGO Blowup (Explosive Taco)
- Target (Diaper)
- “I don't wanna eat my green beans!”
- — Jeffy's first line when leaving the game
- “You wanna see my pencil?”
- — Jeffy's first line when idle
- “UH UH UH.”
- — Jeffy's second line when idle
- “I got my big boy pants on.”
- — Jeffy's third line when idle
- “Why you do that?”
- — Jeffy's line when respawning
- “Hey daddy, what doing?”
- — Jeffy talking to Mario
- “Get out, Mr. Green Booger.”
- — Jeffy talking to Creeper
- “AHHHHHHHHHH! Why you do that, Mr. Green Booger?”
- — Jeffy whenever Creeper explodes
- “AHHHHHHHHHH! Spider!”
- — Jeffy talking to Spider or Shelob
- “AH! SCARY OSTRICHES!”
- — Jeffy talking to any bird character
- “Don't tell me purple elephants don't exist, daddy.”
- — Jeffy riding the Tandem War Elephant
- “I want Froot Loops.”
- — Jeffy talking to Eris
- Jeffy pulls out a white balloon, then inflates it, bouncing on it with his butt until it pops, causing him to scream.
- Jeffy pulls his pencil out of his nose and draws a purple giraffe on a sheet of paper.
- Jeffy throws his diaper at the enemy's face.
- Jeffy throws an Explosive Taco on the ground.
- In Super Mario Logan, he is voiced by Lance Thirtyacre, who reprises his role in the game.