Yes. There are gay characters.
An unseen character, Ashley Kerwin's father is gay, and he didn't come out until after he was divorced from her mother. This all happened before the show starts, but they bring it up a lot.
Marco is gay, but he hasn't told everyone yet. Some of the characters are having a hard time adjusting to it, but some are very accepting. Kinda realistic.
Paige's older brother Dylan is openly gay. He is a fairly new character. There is a great deal of foreshadowing that he and Marco will date.
(If you are from Canada, please do not post spoilers about season 3, as it has not yet aired in the USA!)
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Magnetic Personality. Check it out!