Tammy will be the hero.
Although, according to the complaints of some, season 3 has been rather "flat" or still just getting warmed up (3/4 of the way through), Tammy is one character who has an arc.
In the conversation between Denise and Cole, Cole's defense of Tammy was a hint that she is destined for greatness. Initially it seemed sometimes that Tammy was Cole's pet, but we've also been shown that -- while Cole appreciates Tammy's allure as much as the next hetero male -- they are not involved. Further, Albert revealed how they had been grooming Tammy. Tammy's great anxiousness at the start of her induction into the Blue Rose squad -- or rather the way the direction dwelt upon it -- puts Tammy into the forefront as a character about to embark on a quest. I think it's a quest that will end with her as the decisive hero.