Elena: Elena & Atie are both kind, caring, brave & strong. They'd do anything for the people they love.
Izzie: Izzie & Atie are both kind of romantic & just the dreamy type, but also very strong!
Caroline: Caroline is so lovely & so is Atie, and idk, I just see so many similarities.
Haley: As well as with Haley. Haley adds to Atie's intelligent part, too, and she's so nice but can stand her ground.
Jo: Jo & Atie both want to do the right thing & they'll protect the people they love, and they're both adorable!
Lexie: Same reasons as with Jo <3

Well i will always see Atie as Brooke first & foremost, but since i see a number of similarities between Caroline/Brooke, Caroline is definitely the next best choice!