McMantle

Rosie is the het ship between Josie and Reggie from the Riverdale fandom.

Canon
Josie and Reggie hook up in a jingle jangle haze, but continue to flirt the following day as they clean up Pickens Park as punishment for their drugfest. Later on Josie reveals to Cheryl that Reggie has offered her a gig at his Dad's car dealership that pays $5000 — if Josie will allow Reggie to be her escort. Josie clearly seems to be enjoying how hard Reggie is trying to get another shot at spending time with her. As Student Council elections arrive, Josie and Reggie team up, with Reggie running for President and Josie as VP, dubbed #TeamRosie. They participate in a debate against the two other teams, where they stand strongest. After the riots, Reggie becomes more self-aware and doesn't feel he should be in the race any longer, whereas Josie doesn't want to be in politics but focus on her music.

Fanon
This is the most common ship for both characters and the only canon ship for Reggie. McMantle took off when the relationship was teased prior to Season 2 and cemented when they got together at a party and subsequently flirted. Despite the ship being canon, it hasn't been afforded development past the aforementioned, only with few hints here and there.

Fandom
FAN FICTION

TUMBLR

Trivia
"During blocking our director Steven Adelson said ‘get comfy’ so I put my legs over Charles’ and my head on his shoulder. Then Stephen was like, '.... maybe not that comfy. Rosie isn’t there yet.'"
 * Charles Melton (Reggie Mantle) calls the ship McMantle.
 * Ashleigh Murray (Josie McCoy) tweeted this about their Season 2 finale scene:

- Ashleigh Murray