Suggestions by @user_237368

Transformers

as SpongeBob Squarepants in Most Wanted Crossovers

Score: +4

The Amazing World of Gumball

as Adventure Time in Most Wanted Crossovers

Score: +5

Regular Show

as Adventure Time in Most Wanted Crossovers

Score: +4

Teenage Mutant Ninja Turtles (2012)

as My Little Pony in Most Wanted Crossovers

Score: +4

Winx

as My Little Pony in Most Wanted Crossovers

Score: +1

Cars (Franchise)

as My Little Pony in Most Wanted Crossovers

Score: +2

The Transformers

as My Little Pony in Most Wanted Crossovers

Score: +2

Danny Phantom

as Invader Zim in Most Wanted Crossovers

Score: +3

My Life as a Teenage Robot

as Invader Zim in Most Wanted Crossovers

Score: +2

Transformers: Prime

as Frozen in Most Wanted Crossovers

Score: +4

Robotboy

as Kim Possible in Most Wanted Crossovers

Score: +11

Danny Phantom

as Kim Possible in Most Wanted Crossovers

Score: +13

Teenage Mutant Ninja Turtles (Franchise)

as Mulan in Most Wanted Crossovers

Score: +9

Teenage Mutant Ninja Turtles (Franchise)

as Kung Fu Panda in Most Wanted Crossovers

Score: +8

The Legend of Korra

as Transformers in Most Wanted Crossovers

Score: +8

Avatar: The Last Airbender

as Transformers in Most Wanted Crossovers

Score: +8

The Owl House

as Avatar: The Last Airbender in Most Wanted Crossovers

Score: +12

Spider-Man (Franchise)

as Avatar: The Last Airbender in Most Wanted Crossovers

Score: +13

King Kong (Franchise)

as Avatar: The Last Airbender in Most Wanted Crossovers

Score: +13

Godzilla (Franchise)

as Avatar: The Last Airbender in Most Wanted Crossovers

Score: +13