If they're ALIEN they may be completely different than any of those! I laugh when detailed descriptions are given of aliens that make them sound like fancy humans ... aliens are not necessarily anything like humans or humanoid.

But just because they don't look like us doesn't mean they are evil. Most of what's out there has evolved to the point that they live and let live ... they appreciate diversity and don't feel the need to kill everything that's different than them (unlike humans). In fact they know how hostile, violent, and ignorant humanity is and that's why they stay a safe distance from us, except to interact with individuals on the astral plane or dream state or interdimensionally.