Are there gay slenderman characters

It's true. Here's a source. Slenderman isn't owned by a specific person. It's a shared universe that anyone can contribute too. A random shitpost is as canon as anything else, so the AI overview isn't exactly wrong here.

Again Updated Slender Post: Sexualities and Partners go as followed: Slenderman is Demisexual/Biromantic, Dating Zalgo. Splendor is Pansexual, Dating The Rake Tender is gay, single Trender is bisexual leaning towards guys, Dating Homicidal Lui.