Suggestions by @cartoonmultiverse

Donatello (Rise of the TMNT)

as Donnie (Rise) in Tmnt: Multi-Lost

Alopex (IDW)

as IDW Alopex in Tmnt: Multi-Lost

Donatello (Mirage)

as Mirage Donnie in Tmnt: Multi-Lost

Raphael (Mirage)

as Mirage Raph in Tmnt: Multi-Lost

Raphael (TMNT 2012)

as Raph in Tmnt: Multi-Lost

Leonardo (TMNT 2012)

as Leo in Tmnt: Multi-Lost

Jennika Smith (TMNT)

as Jennika in Tmnt: Multi-Lost

Donatello (TMNT)

as IDW Raph in Tmnt: Multi-Lost

Raphael (TMNT 2003)

as Raph (03) in Tmnt: Multi-Lost

Moana

as Moana in Tmnt: Multi-Lost

Raphael (TMNT 1987)

as Raph (80s) in Tmnt: Multi-Lost

Leonardo (TMNT 1987)

as Leo (80s) in Tmnt: Multi-Lost

Donatello (TMNT 1987)

as Donnie (80s) in Tmnt: Multi-Lost

Michelangelo (TMNT 1987)

as Mikey (80s) in Tmnt: Multi-Lost

Ultron Infinite

as Ultron Infinite in Aang

Sage (High guardian spice)

as Sage in Aang

Moana

as Moana in Aang

Glimmer

as Glimmer in Aang

Michelangelo (TMNT 2007)

as Mikey (07) in Aang

Kuvira (Legend of Korra)

as Kuvira in Aang