How do you measure that? GLaDOS in the original Portal is an incredibly powerful supercomputer but her emotional maturity and overall sanity leave much to be desired, to the point we cannot reasonably assume she would truly comprehend basic human interactions (despite analysing them while using the humans as lab rats). Xenomorphs clearly possess
some level of self-awareness and regularly outsmart humans, but only in "primitive" and "uncivilised" ways. The Zerg Overmind definitely
could understand humans if it
wanted to (it doesn't). Geth and
You must be registered to see the links
become more intelligent the more of them group together, both are well below humans individually but at least the former can greatly outpace humans within the same body size.
By what standard?
You must be registered to see the links
's how messy it gets just with real-life humans. Do "dog years" apply? Remilia and Flandre from Touhou are centuries "old" but mentally stuck as young girls for the most part. Shinichi/Conan should be 18+ by now but Conan's body is a child's, with his adult mind fully intact. Star Wars Clonetroopers and the like can grow to full physical
and emotional maturity in months or less. Timelords could presumably regenerate into a "younger than 18 years" body with a weird mix of incarnation-specific immaturity and centuries of wisdom. Some fairies or the like might regularly reform with full memory loss, or even exist outside of time altogether.
You're missing writing, sign language and most importantly body language. If it can understand humans, is 2+m tall and not restrained or drugged it's definitely consenting, by virtue of not squishing you.
See the first point.
Well, not under normal conditions
You must be registered to see the links
...
Also on the other end the list needs some kind of exclusion criterion for being too close to humans. Catgirls and the like aren't "pure humans" but calling them "monsters" is a bit misleading too. It's a bit of a loaded term, for example neither we nor in-universe humans would typically call Asari "monsters" but if one broke out the biotics in a real life bar fight we
definitely would. And we also call biological humans monsters for particularly immoral behaviour, meanwhile neither Samus Aran nor 2B are biologically human.