Suggestions by @juliolopez

Bill Hader

as Star in Balto (1985)

Score: +2

Barry Humphries

as Nikki in Balto (1985)

Score: +2

Jim Carrey

as Tigger in More Adventures of Winnie the Pooh

Score: +2

Steve Buscemi

as Rabbit in More Adventures of Winnie the Pooh

Score: +2

Jim Carrey

as Bert in Ernie & Bert

Score: +2

Barry Humphries

as Ernie in Ernie & Bert

Score: +3

Steve Buscemi

as Bert in Sesame Street

Score: 0

Barry Humphries

as Herry Monster in Sesame Street

Score: 0

Barry Humphries

as Ernie in Sesame Street

Score: +1

Barry Humphries

as Herry Monster in Blue's Clues visits Walt Disney World

Score: +1

Barry Humphries

as Harry in Sesame Street (Live action)

Score: +2

Steve Buscemi

as Grover in Sesame Street (Live action)

Score: +1

Steve Buscemi

as Bert in Sesame Street (Live action)

Score: +1

Steve Buscemi

as Gurgle in Finding Nemo

Score: +1

Rodger Bumpass

as Ren in Ren and Stimpy(2020 reboot)

Score: +1

Mr. Lawrence

as Stimpy in Ren and Stimpy(2020 reboot)

Score: 0

Rodger Bumpass

as Waluigi in A merry mario Christmas

Score: +2

Mr. Lawrence

as Wario in A merry mario Christmas

Score: +2

Billy West

as Wario in The Wario Bros Show!

Score: +1