Sully does say "I need a medic!" I've heard it many, many times.
I use Elena's, "Ooh, I love these" I think she says it when she picks up a new gun. I'll generally use it at work when I'm given some menial task to do...so a lot
While playing plunder, anytime I pick up the treasure I'll say, "I've got the treasure" the way that Chloe says it, but really slow and deep. I played with a guy that refused to admit he was using a voice changer to lower his voice and we all figured for sure he was using one during a plunder match. Chloe picked up the treasure, but a very manly voice came through his mic with just a hint of Chloe. That was the best
This! I say this also but replace the word treasure. I love the way she says it, and I say it in her accent too. Usually say it when playing with my younger cousins. I'll take thier toy or something and say "I've got your ca-aar" or something along those lines