They're both one and the same. Also why necropost something nonsensical?

It's not nonsencial. the phrase "one and the same" is redundant. Sex and gender are different. Take alluka from hunter x hunter or miyu corpse party for example. Alluka and Miyu are both male in terms of sex but female in terms of gender.

Okay, so with the reveal of you not knowing what the word "redundant" means or what a turn of phrase is, I'll be adjusting my explanation appropriately.

Also, I don't watch garbage so I haven't seen Corpse Party. That being said, Alluka was a male child that just dressed like a girl. He was still male. There was no contention over that. Don't project your weird concepts onto children. That's creepy.

I'm not projecting any weird concepts onto anyone. The person closest to Alluka is Killua. Killua refers to Alluka as female. The people who call Alluka a boy are her family,who didn't treat her well in the first place.  Alluka was not "a male child that just dressed like a girl" Alluka's gender is listed as female on hunter x hunter wiki. not only that,but also they literally confirmd alluka's gender as female within the anime itself. TattoodSquid, you are probably friends with TonySansNom of steins:gate wiki and anyone who calls *insert trans girl here* a boy. Alluka is a girl. Alluka is confirmed to be a trans girl. alluka is confirmed female in gender by the anime itself and male in sex by the official databook.

Alluka from hunter x hunter clearly identifies as female. 

@ Both of you, chill.

First off, gender varies from culture to culture. The ideas you are arguing over don't even properly translate into the mainstream Japanese culture, let alone back out.

Yes, there are actual trans characters out there. Hibari from "Stop!! Hibari-kun" is a great example of this from the early 1980s. That said, if you want to argue from a Japanese perspective, Rui is not. Crossdresser yes, trans no. There is a fine line between the two. While not confirmed, an argument could be made for nonbinary, but that's shorthand for "Doesn't fit into pre-prescribed gender roles of society." It does not mean a lot of the stuff people try to ascribe to it. (I'm looking at genderfluid/genderflux as core examples of what it doesn't mean, since those aren't genders, merely modifiers of one's gender.)

Now, using Ruka from Steins;Gate is an interesting question. Is Ruka actually trans? An argument could be made for "yes, but because of traditional values she doesn't transition (ignoring the situation with the phone microwave)." An argument can also be made for "no, he just wishes he was a woman because of how much he's in love with Okarin and wants to be a woman due to orientation not gender identity (again as a result of traditional values)." There isn't a simple term in English for that second argument. ("Ruka is gay" is an understatement; "Ruka is trans" is an overstatement.)

Then there's Dororo from the show "Dororo" (looking at 2019 version). She goes around and acts like a boy, talks like a boy, and is for all intents and purposes a young boy during the beginning of the show, but we know she's a girl. People try to argue that she's FtM trans, but quite simply that's not the case because she's merely trying to emulate her image of strength in order to fit her needs, desires, and goals. She's acting that way because she feels she has to, but we also see her admiration of strong women as well which serves to prove she's only doing what she thinks is strong.Her behaviour is not an inherent outward reflection of what she is, merely who she believes she needs to be.

This why you can't just slap labels onto fictional characters to make yourself feel better. You aren't them. All you're doing is projecting your own ideals. This goes to both of you. TattoodSquid, Alluka does express desire to be seen as a woman as that is her gender identity. PikaPika200, you inferred that Rui wants to be seen as a woman, but that's not really implied. There is a serious difference between the two. It's like saying Alice from Bakugan is an FtM trans because her other form is that of Masquerade. You can't just assume that because they dress as the other sex sometimes then they must be trans. At that point Assassination Classroom's Nagisa is trans too, which we know for a fact he's not.

</frustrated_rant>