"Grass grows, birds fly, and brother, I hurt people! I'm a force of nature! If you were from where I was from, you'd be f**** dead!" - Meet the Scout
"I fear no man. But that thing...? It scares me." - Meet the Pyro
"Ohhh, they're gonna have to glue you back together! IN HELL!" Meet the Demoman
"Some people think they can outsmart me. Maybe, maybe. I've yet to meet one that can outsmart bullet." Meet the Heavy
"How am I gonna stop some big mean mother hubber from tearing me a structurally superfluous behind? The answer, is a gun. And if that don't work? Use more gun." Meet the Engineer
"Be Polite, Be Efficient, have a plan to kill everyone you meet." Meet the Sniper
"Now? Let's go practice medicine..." Meet the Medic
The only one I can't quote is the Meet the Spy trailer xD
English
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"Mphmphmph. MMMMMM MMMMMM!" - Pyro