you don't have to like anyone or anything, but you are being transphobic. it's very much rude to complain about the physical attributes of a person or in this case a character. and just because this is an NSFW project, doesn't mean every character has to be appealing to everyone reading. believe it or not there are plenty of people who would take interest in stories featuring trans men but can't find it anywhere because of backlash like this.
Since when lack of interest/dissapointment means hatred? Or is ceaseless praise the only input allowed here?
If you enjoy the route as it is, good for you and anyone who thinks that way. But I came in hoping for a M/M VN, so my expectations kinda deflated on this route. If it were a side route with a side character (like the skunk woman seems to be) I wouldn't have the slightest issue except the odd irk about dates. Mind you, I even find some of the (actual) guys (namely Mark and Etienne) not much of my liking.
Also, there's nothing inherently wrong on putting a character like Hiro in stage. But I must repeat myself, why, of all reasons, his route was set at the height of the militaristic Imperial Japan era. The goddamn 30s, for crying out loud. While not impossible, is REALLY improbable. Every other character has a realistic background, except Hiro.
First of all, trans men are men, this is M/M. Also, you say you would be okay if it was Simone or some of the other guys you are not that interested but Hiro not being born with a penis is the only one you made a fuss over. I said before you don't have to like anyone, even I'm not that interested in most of the characters actually, doesn't mean it's okay to body shame them like you are trying to do with Hiro.
And "(actual) guys" is a blatant transphobe statement. The whole "really unlikely" argument you are going for is clearly just an excuse you are using to justify your bias. The fact that they are animals doesn't seem to bother you in spite of it being much less possible. Gabriel, also doesn't have the standard set of genitalia. Your "disappointment" is full of contradictions.