Spongebob Syndrome

Typically a character in media who shows every sign of being gay, but turns out to be straight.

The term "Spongebob Syndrome" coming from the fact that Spongebob himself has married Sandy the Squirrel canonically, despite being assumed gay. (writers even attempting to correct this later on.)

Important to note that Spongebob Syndrome does not apply to characters like James from Pokémon, as he's believed to be bisexual.

Hey dude, remember that character from that one TV show? The one who flirted with pretty much every guy he ran into? He has Spongebob Syndrome, he isn't gay, he's dating a woman!