SuperFlash

SuperFlash is the het ship between Kara and Barry from the Arrowverse fandom.

Canon
Kara and Barry meet when Barry's training to improve his speed and runs fast enough to cross the dimensional barrier to Earth-38, where he saves Kara's life. She informs his this was unnecessary and flies away, revealing that she's Supergirl. Barry follows and they collide, both realizing that they're both superheroes. Barry enlists Kara's help to return to his earth, while Kara is thrilled to have a 'superhero colleague' with which to share understanding of her lifestyle.

In Autumn 2016, when the Dominators threaten Earth, Cisco breaches himself and Barry to Supergirl's Earth-38 and into her living room. Kara's surprised to find Barry there, but glad to see him and he tells her they need her help against an alien attack. Kara's response is to immediately spring into action like the hero she is and travel to another earth in the multiverse for the first time, with Barry. Kara accompanies Barry to meet the Legends and Team Arrow for the first time. When Barry tells the team-up about Flashpoint, Kara is one of the only people to stand by Barry, saying that she'll always trust him. They both help Oliver's team to get the tech to track the Dominator ship that capture several of their teammates. After they defeat the Dominators, Kara calls Barry and Oliver Earth's Mightiest Heroes and the three of them share a group hug.

In 2017, Kara travels with her sister Alex to attend Barry's wedding, in spite of her recent heartbreak and at the wedding reception at CC Jitters, Kara hangs out by herself upstairs away from the crowd. Barry goes to talk to her and asks where her boyfriend is, prompting Kara share with Barry her break-up and how hard it is. Barry tries to console Kara by relaying his own experience with romance and superpowers, but concedes that what happened to Kara is beyond even his time travel shocks. Perhaps in an effort to cheer her up, and because of their friendship, Barry asks if Kara will sing a song at the ceremony and she agrees.

As Kara sings, the ceremony is interrupted by Nazis from Earth-X and Kara must fight off her evil Nazi doppelgänger in a spectacle inside the church, as Barry, Green Arrow, Frost, Vibe, Firestorm, White Canary, Heatwave, Kid Flash, Alex and Harry fight alongside her. After the Nazis retreat, Kara helps escort Earth-X Prometheus to S.T.A.R. Labs and then goes to the cortex to discuss what's going on with Barry and the others. Kara and Barry also witness the reveal of Earth-X Prometheus as Earth-X Tommy Merlyn in the pipeline.

Fanon
Superflash is a fairly common pairing, although both characters have bigger het/femslash/slash ships on their respective shows. The pairing is popular due to Kara and Barry's commonalities, such as their sunny demeanours, and the fact that the chemistry was evident from the moment they met. The popularity also stems from both being the title characters helming their own shows, with Kara being the first female superhero to have her own show in the Arrowverse. On AO3 it is the fifteenth most written ship for Barry and the ninth most written for Kara. It is also the fifteenth most written in the Supergirl (TV 2015) tag, and the twenty ninth most written in The Flash (TV 2014) tag.

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