Suggestions by @shanespicer

Steven Yuen

as Leonardo in TMNT: The Animated Series

Score: -1

Justin Cook

as Raphael in Teenage Mutant Ninja Turtles: Urban Legends

Score: +1

Steven Yuen

as Leonardo in Teenage Mutant Ninja Turtles: Urban Legends

Score: +1

Aleks Le

as Leonardo in TMNT: The Animated Series

Score: -1

Yuri Lowenthal

as Donatello in TMNT: The Animated Series

Score: -1

Troy Baker

as Casey Jones in TMNT: The Animated Series

Score: +1

Ashly Burch

as April O'Neil in TMNT: The Animated Series

Score: -1

Ron Yuan

as Oroku Saki in TMNT: The Animated Series

Score: +2

Matthew Yang King

as Hamato Yoshi in TMNT: The Animated Series

Score: +2

Aleks Le

as Michelangelo in Casting a random character every saturday #17: TMNT

Score: +1

Mark Whitten

as Leonardo in Casting a random character every saturday #17: TMNT

Score: +1

Belsheber Rusape Jr.

as Donatello in TMNT: The Animated Series

Score: 0

Clifford Chapin

as Raphael in TMNT: The Animated Series

Score: 0

Mark Whitten

as Leonardo in TMNT: The Animated Series

Score: 0

Yuri Lowenthal

as Leonardo in TMNT: The Animated Series

Score: 0

Zeno Robinson

as Donatello in Teenage Mutant Ninja Turtles: Animated Series

Score: +1

Dominic Catrambone

as Leonardo in Teenage Mutant Ninja Turtles: The New Animated Series

Score: +1

Josh Keaton

as Donatello in Teenage Mutant Ninja Turtles: Animated Series

Score: -1

Aleks Le

as Michaelangelo in Teenage Mutant Ninja Turtles (Animated Series)

Score: +1

Aleks Le

as Michelangelo in TMNT: The Animated Series

Score: +1