I don't think ive ever seen anything like that sadly :( i dont know that much about tamagotchi hacking and if that would be possible to do on the tamagotchi ON but! hopefully it is!

Im not sure about this, but isnt same sex marriage in japan illegal?

Ok. Thank you guys for answering!

I don't think so but I could be wrong.

Same sex marriage is indeed still illegal in Japan. More importantly, if your Tamagotchi were the same sex they wouldn’t be able to make a baby, which is literally the only reason the marriage mechanic exists... Nothing in the game says your tamagotchi has to be cisgender though, so you might want to play with that idea instead of modding the game.

It shouldnt really affect your gameplay much but youd have to search a bit harder for certain genes since you can't marry a tama that has the traits you liked but wasn't the opposite gender. Boys and girls can inherit any characteristic of any parent, regardless of their gender in this game. Your little dude can look feminine and marry a female, giving the illusion of them actually being same sex.