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Never invent a set of rules for how exotic science works in your story, then change it in mid-stream (or, in a series, from book to book). Consistency is vital, especially because SF readers key in on that stuff like red flags waved at bulls.
It is considered "bad form" to have aliens reveal hidden traits or powers at way-too-convenient moments, like when it looks like the protagonist is about to die at the climax. If it happens early in the book, when characters are still being established, it can be forgiven.
Try not to pattern aliens too closely after stereotypes of Earth nationalities. It usually comes off as racist. (Sorry, Star Trek.)
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