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Sometimes they look rather less like humans, in which case (if friendly) they often resemble large teddy bears.
In general, Aliens fall into two distinct groups, REALLY ALIENS and ALIENS WITH FOREHEAD RIDGES.1) Really Aliens are truly unearthly. The occasional intelligent bear or radish may also appear, or practically anything else.Convergent evolution might well produce a generally humanoid body plan, just as sharks and dolphins have a similar overall configuration.But Aliens with Forehead Ridges have much more than a general similarity to Earth Humans.Etymologically, and in mainstream English the word means "feeling" but is rare and now archaic.[From Poul Anderson's `Polesotechnic League' stories, going back at least to 1963]An evolved biological intelligence.Implies human-level cognitive and linguistic ability but not necessarily tool use.