Groot is the Iron Giant

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Marceline, from Adventure Time is the little girl from Love Actually

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Ferb is the little boy from Love Actually AND he's Jojen Reed

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Eliza Thornberry is Gretchen Wieners

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Katara, from Avatar: The Last Airbender, is one of the 7 Evil Exes Scott Pilgrim has to fight. You might also know her as Anne Veal, but probably not.

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Prince Zuko is Rufio

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