Characters: Johnny Test

This is a character sheet for Johnny Test.

Johnny Test

Voiced by: James Arnold Taylor
The show's protagonist and youngest member of the Test family. Johnny creates many of the show's plots through his willingness to abuse his sister's inventions or cut some corner in life. His best friend is Dukey, his (talking) dog. Occasionally Johnny fights crime using superpowers gained from his sisters under the name Johnny X.


Voiced by: Louis Chirillo (season 1-4), Trevor Devall (season 5-6)
Johnny's talking dog who was genetically enhanced by Susan and Mary some time before the series. Dukey's main job is to act as Johnny's voice of reason even if he's prone to being ignored. That said, he's more than capable of doing the wrong thing himself if properly motivated (such as with steaks). On more than one occasion he acts as a crimefighter alongside Johnny under the monikers Super Pooch, X Pooch or Super Dukey, though after the earliest incidents he expresses a dislike for doing so.

Susan and Mary Test

Susan Voiced by: Maryke Hendrikse
Mary Voiced by: Brittney Wilson (season 1, 5); Ashleigh Ball (season 2-4, 6)
Johnny's older twin sisters who attend the Mega Institute of Technology. Both are geniuses capable of devising whatever machine the plot demands and most episodes relate at least partially to one of their experiments. Both Susan and Mary have a crush on local boy Gil that can work against them. Susan is also the object of affection of resident villain Bling-Bling Boy. Both sisters look identical except for their fashion choices (Susan wears squared glasses, a skirt and knee socks and has straight hair; Mary has curved lenses, wears jeans and has curled hair).


Voiced by: Andrew Francis
A pleasant local boy who's friends with Johnny. He's the romantic target of both Susan and Mary, though he can never seem to remember their names.

Eugene "Bling-Bling Boy" Hamilton

Voiced by: Lee Tockar

Hugh Test

Voiced by: Ian James Corlett

Lila Test

Voiced by: Kathleen Barr

Sissy Blakely

Voiced by: Brittney Wilson (season 1, 5); Ashleigh Ball (season 2-4, 6)

Bumper Randalls

Voiced by: Scott McNeil

Janet Nelson Jr.

Voiced by: Kathleen Barr

Mr. Black and Mr. White

Voiced by: Bill Mondy and Scott McNeil, respectively

Brain Freezer

Voiced by: Louis Chirillo (season 1-4); Bill Mondy (season 4-5)

Doc Beebles

Voiced by: James Arnold Taylor

Dark Vegan

Voiced by: James Arnold Taylor


Voiced by: Lee Tockar
  • Child Hater: See below.
  • Corrupt Corporate Executive: He's the head of a toy company named after him, but devotes all his time to finding ways to get rid of kids.
  • Cut Lex Luthor a Check: Averted, sorta. His board of directors asked him if they'd go out of business if his plan succeeded. Turns out he'd already thought of that and programmed his robots to offer to 'babysit' the kids for free to keep their parents happy. Still, he's a brilliant enough man that his smarts could be better spent elsewhere.
  • Devil in Plain Sight: His company is still afloat despite him being obviously psychotic and his company producing extremely dangerous toys with the intent to maim or 'get rid of' kids. Handwaved in that his legal team is apparently extremely good.
  • Disproportionate Retribution: He built an army of extremely powerful robots to imprison kids in their own houses just for annoying him.
  • Genre Blind
  • Legion of Doom: He's the leader and founder of the 'Johnny Stopping Evil Force Five'.
  • Would Hurt a Child: His entire character is this.

Jillian Vegan

Voiced by: Maryke Hendriske

Mr. Mittens

Voiced by: James Arnold Taylor