 If you liked
Tenkuu no Shiro Laputa
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 ...then you might like
Gake no Ue no Ponyo
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Both are very kawaii and directed by the famous Hayao Miyazaki. Castle in the Sky and Ponyo on the Cliff by the Sea both have that classical feel and same art style with the two lead characters as a boy and a girl. Ponyo by the Cliff by the Sea is a bit more on the childish side, while Castle in the Sky has a deeper meaning and story.