He is in a long time relationship with actress Cote de Pablo which would suggest he is heterosexual.
Diego Adán Morales has never publicly discussed his sexual orientation.
No, he is not gay.
As of now, Diego Klattenhoff has not publicly identified as gay, and there is no confirmed information about his sexual orientation. He tends to keep his personal life private, focusing more on his career in acting. Speculation about someone's sexual orientation without their confirmation can be misleading and should be approached with caution.
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.
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.
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.