#9 Alicia Fox, signed in 2006
It's pretty surprising that Alicia Fox has managed to stick around this long. She isn't bad, per se, but she isn't great at anything either. In fact, her wrestling ability has basically become a meme. Fans sarcastically refer to her match with Melina as one of the best of all time as a reference to when Cameron seriously said so on Tough Enough.
Nevertheless, she has been in WWE a long time and is their longest tenured female superstar. Foxy lived through the days of the Divas, even becoming Divas Champion in 2010, and now she's made the transition to the new WWE since the Women's Revolution. No, she's not hanging with the likes of Sasha Banks and Charlotte and putting on instant classics in the ring, but she's found her niche.
She's mainly been used as a valet lately, first for Cedric Alexander and then for Noam Dar. And she's actually pretty good at that. She plays the crazy girlfriend/ex-girlfriend role perfectly.
Despite this talent, it's still a bit of a surprise she's still around. WWE is quickly starting to prioritise wrestling ability over anything else, hence the absence of nearly all of the female superstars from the era of the Divas Championship. But Foxy has stuck around, and if she's still under contract this time next year, that will make 12 consecutive years for her in WWE.