I find Brenna slightly more tolerable than Mikalah, but they're both annoying as hell. I agree with pretty much everything cabarethed said, especially the Heather and Kellie comments.
Re: Brenna as comic relief, I get the feeling that the judges didn't necessarily go with the most talented girls who auditioned because they want a male winner this year, someone to win teenage girls' hearts and wallets (3 of the 4 winners thus far, including the winners from the 2 most recent seasons, were female, and the only male winner thus far has pretty much dropped off the radar). Otherwise, there's absolutely no justification for some of the female semifinalists making it this far (not that I think it's right for the judges to stack the deck in favor of one gender, but I'd prefer to think they did that than to think they picked people like Brenna, Becky, and Heather because they thought they were among the 12 best girls who auditioned)
"There was this one time an alarm went off - it was in the middle of '24.' That's just wrong. Everyone knows everyone was watching '24' at that time."
--NYU student quoted in the Washington Square News about students ignoring the frequent fire alarms in dorms