The fictional character of Captain Hook was not written with any sexual orientation in mind. The character is never depicted in romantic situations.
Graeme Smith is straight.
Captain Hook is a/an Pirate
Captain James Hook
His openly gay and a member of the Wednesday club, recruited by Captain Wednesday himself.
Captain Hook was created in 1904.
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.
Captain Hook had no friends, only some shipmates.
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.