Haku's from Naruto, right?
Poison is a transgender. She was originally 100% male but had gotten operations before the games started. It is unknown if she still has a trunk or not, but chances are she did a full operation, as it would be difficult to tuck something away in shorts that tight.
She was made to be trans so that feminists wouldn't get angry, but LGBT groups were ticked off when it was claimed that "she smelled like a man" - since full-op transgenders are supposed to have the pheromones of their new gender, not their old one.
Transgenders aren't traps - they are 100% the new gender. So Poison is thus, officially, FEMALE.
The picture of the green haired guy isn't an official look for Poison. It's an unofficial look given as a choice to players. So, it's sort of like a character skin.
Tenshi Nova: Yo Krest, new best buddy! Come give me a hug.
Blood Lord: May whatever God you pray to save your ass when BR reads this, Krest.
Havoc: For the love of Christ & his next-door neighbor Frank! You've successfully pissed off someone with the power to ban a Mod!
BeeAre: you are breaking new bad ground. breaking bad. meth. you smoke meth.
Ari-6: Oh no! Krest's patented sense of humor! What ever will we do without it!?
Randori: Welcome back Krest. Was wonderin' where your goofy ass went.
"I like to think, to read. I'm into freedom of speech, of choice. I'm the kind of guy who'd sit in the Greasy Spoon and think, 'Gee, should I have the T-bone steak or the big rack of barbecued spare ribs with the side order of gravy fries?' I wanna smoke a Cuban cigar the size of Cincinatti in a non-smoking section. I wanna run around naked with green jell-o all over my body while reading a Playboy magazine." - Edgar Friendly