the answer is heavy
it is used as a kill-assist and thanks voice
he actually says "we make good team!" and not "you make good team"
fun fact: he does not put a "a" in "we make a good team" due to him being from the soviet union aka russia (we know this because of his accent and use of russian words like "da" and "net" + some if not most of his cosmetics are russian related) so he probably does not know much english but knows the right amount of english to be some-what understandable (some of the other mercs are from non-english speaking countries for example medic is german (like the heavy, we know because of his accent and use of words like "ja" and "nein"))
