 If you liked
Brigadoon: Marin to Melan
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 ...then you might like
An Ling Yu Shi Di Qi
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These series are about a normal girl being involved in a way with a conflict between aliens, so she has to cooperate with one of them while dealing with her personal problems at the same time.
Each series has its own take on this kind of story, Stitch And Ai being more light-hearted just like in the whole Stitch franchise, but both have the same core elements : a story about friendship, family and trust, and a cute and colorful artstyle pleasing to the eye.