Yes he is very gay.
Costas Mandylor has generally kept his personal life private, and there has been no public confirmation of his sexual orientation. He has been linked to various relationships over the years, but he has not publicly identified as gay or bisexual. As such, any definitive claims about his sexual orientation would be speculative.
The character of Flapjack is not written with sexual orientation
Nothing is known of her sexual orientation.
The Joker's sexual orientation is not written into his character.
Soko's sexual orientation is heterosexual/straight.
The fictional character of Yoshi is not depicted with sexual orientation.
The SNL character "Gilly" was not written with sexual orientation.
Matt Evers' sexual orientation is not known.
The sexual orientation of David Rodriguez is unknown.
Frankie Muniz has not stated his 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.