 If you liked
Pokémon DP: Pocket Monsters Diamond Pearl Monogatari
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 ...then you might like
Fairy Idol Kanon
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Pokémon DP Adventure and Fairy Idol Kanon are two kids manga featuring young human kids and fantasy creatures (mainly fairies in Kanon's case). Both series are mainly light-hearted stories about friendship, but they are not afraid to go into heartfelt and somewhat sad territory when it comes to things like backstories, and they do the job pretty well in my opinion. The characters aren't super developed, but you may find yourself rooting for them regardless.