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Jeffy Jeffy, known simply as Jeffy, is a secondary antagonist, later turned protagonist of the SuperMarioLogan franchise. Known for being a foul mouthed, dim-witted, weird,  ill-behaved, dumb, perverted young teenager with an unusual personality and a strange choice of clothing; he is the adoptive son of Mario and his wife Rosalina.

Voice Actors

  1. Lance Thirtyacre
  2. Anthony Miller (formerly; animal noises)
  3. Chris Netherton (Jeffy's Brain! French accent and Old Jeffy in Baby Jeffy!)
  4. Chilly Jimenez (Jeffy's BIG Easter!)
  5. Tito Jimenez (adult)



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