monchele29
What if there was a Kara from Earth-1 and she was adopted by the Merlyn's instead?
Kara was good friends with Sara and Laurel; she happened to befriend Oliver, which her older brother didn't like, and she was getting closer to his best friend.
Kara slept with Oliver once at a party, and after that night, Tommy didn't let it go and left her alone with Oliver without supervision. She was the only one who knew that Sara and Oliver were seeing each other behind Laurel's back.
Before the whole yacht accident, Kara and Tommy got into a huge argument about college and Oliver, Sara had asked if she wanted to join her with Oliver and his father to China for an escape from her brother and Laurel.
The next thing Kara knows is that she's being rescued by some ninjas called themselves the League of Assassins. She doesn't come back until after the Undertaking that took her brother's life and sees her friends and Oliver again.
Her return causes some bumps on the road, with Laurel blaming for knowing about Oliver and Sara sleeping together, and Oliver still not over the fact that she is still alive and didn't tell anyone about her whereabouts.
Oliver finds out that she is a part of the League of Assassins and is trying to leave all that behind, but you can't exactly leave without them dying, or they are hunted and returned alive or dead. Oliver and Kara connected emotionally, and it caused feelings to emerge that Laurel didn't like when she arrived at dinner with her ex-boyfriend.