In Plato's time, the cultural attitude toward sexuality was so different, that sexual orientation as we know it was hard to describe. All we can say is that Plato was known to have sexual affairs with both men and women, which was typical of the time.
The Joker's sexual orientation is not written into his character.
Soko's sexual orientation is heterosexual/straight.
Nothing is known of her sexual orientation.
The character of Flapjack is not written with sexual orientation
The fictional character of Yoshi is not depicted with sexual orientation.
Frankie Muniz has not stated his sexual orientation.
The sexual orientation of David Rodriguez is unknown.
Matt Evers' sexual orientation is not known.
The SNL character "Gilly" was not written with sexual orientation.
I think you mistake "sexual orientation" with specific types of orientation. Sexual orientation is a part of every humans make up. A person can not have a sexual orientation. Your sexual orientation is what makes you gay, straight or bisexual. Homosexuality IS illegal in some countries. You can outlaw a behavior but you can't outlaw an urge or feeling.
Reginald VelJohnson has not publicly spoken about his sexual orientation.
No. Plato never had any children, nor did he marry. In fact, it has been posited that he may have been homosexual, a common and widely accepted sexual orientation during Athenian times.