 If you liked
Stitch!
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 ...then you might like
Youkai Watch
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Yo-Kai Watch and Stitch are two gag manga series based on relatively popular characters from other forms of media (game for former and movie for latter). The main character of the series is a regular Japanese elementary school student who then meets a non-human creature and somehow ends up being friends with it, starting a whole bunch of adventures that feature other non-human creatures as well. Relatively kid-friendly and may be easy to find in your local bookstore.