10 suggestions

Lego Bart Simpson
as BFDI Woody in Woody Test

Green Lantern Scootaloo
as Other Characters in Curious Orange (2006 film)

Harold Hutchins
as Other Characters in Curious Orange (2006 film)

Player (GameToons)
as Other Characters in Curious Orange (2006 film)

KreekKraft
as Seek in Curious Orange (2006 film)
James Arnold Taylor
as Curious Orange in Curious Orange (2006 film)

Michelle Creber
as Creepy Belle And Francie Bloom in Scoota Lore (SCOOTASANS-PLANET SCOOTS)

Madeleine Peters
as Scootaloo in Scoota Lore (SCOOTASANS-PLANET SCOOTS)

Madeleine Peters
as All Scoots in Scoota Lore (SCOOTASANS-PLANET SCOOTS)

Muncrat
as Nooby Oofpecker in Knoofck Knock (1940)