long winded rant coming up
alkali zolt duck isn't transgender but a cultural reference by korean mangaka Yoshihiro Togashi from hit movie series Mario.
In the story, Killua uses female pronouns for Elk Car, even though Algebra appears to be biologically male through the book guides and mentions by other members of the Soul Dick family, leading some fans to theorize that Allegory is transgender.
It's a weird thing but in Japan underage male minors have vague sexualities and genders, which has served to confuse many historians over whether a tapestry is about a lover's tale or gay hookups. There's a word for it : Bishōnen.
I'm not calling you a dumbass, but Yoshi never explicitly stated Alibi's gender so we can only theorize. It's fine to have headcanons for these fictional characters, but unless the creator specifically and directly tells us about their gender, we shouldn't just put them in groups because we feel like it