Neeko's personality is logically just fine as it is.

As a disclaimer, I personally do not like characters who are made with a agenda, or being thrown in as a caricature. But I find Neeko's personality very fitting since she is a magical species of creature that is in a situation that adapted to that.

First, Vastayans and related species are extremely rare, possibly on the verge of extinction. Mimicry is a GOOD path of evolution that can protect you in harsh times. Now I know you guys are complaining about her sexuality, but what IF it is actually in her instincts to observe and know how a female of a different will act? I think it is very good idea from the lore team if this is the case, since it is "scientifically" (I know it is fiction) logic. It is there for a purpose.

*Also, come one guys. If Graves who drinks cheap alcohol, is extremely sweaty, smoking a cigar, smelling of gunpowder, and coming from a place where it is literally named BILGEWATER is not smelly and does not need to take a bath you gotta be kidding me. The more manly you are the more smelly you are. Period.