You are right. And you are also wrong.

He is indeed everything you just wrote - at least if we are talking about the character they call "Astolfo" in that anime.

The character people see in hentai or RP as or sexualize in whatever else way? He is a girl. Don't believe me?

• His face isn't even just that of a woman. His face is literally hyper-feminine. His face is more feminine than that of most female supermodels.

• 99.9% of hentai portrays him as wanting to be penetrated like a woman and generally behaving the way a woman would.

• He is always shown wearing feminine clothing, including lingerie.

• He has a hyper-feminine hairstyle: long, braided and pink.

...I don't know about you, but that sure sounds like a woman to me.

But, oh, wait, I hear you say. "He has a penis." So? That makes him into a dickgirl. "No breasts!" A flat-chested dickgirl. In fact, much hentai of him actually portrays him not with the "flat chest" of a man, but with slight bumps that would be called a "flat chest" for women. "None of that matters because he's literally conceived as a male character by his creator." Literally doesn't matter when you're jerking it. How I can make such a claim? Simple. I hereby create my own character called "Miss Girlygirl" who is a female character beloved for her femininity by everyone in the world she inhabits, including winning many a beauty pageant and being lusted after by many straight men. She's also 6 foot 4, ripped, thick body hair all over, double-chin, a face like Sylvester Stallone, can tear you in half, no breast tissue at all, likes nothing better than spending her free time fisting random women. Got a vagina though, so there is that. Clit like a hyena, too. I'll go ahead and wait for all the straight male artists to draw hentai of her and all the straight male weebs to jerk off to her. She's female, after all. Because I said so.

Astolfo is female.