One who will complain about anything no matter what the circumstance, good or bad, but carries out the task anyways.
Tom: Hey Richard, will you watch this briefcase full of gold for me while I go pee?
Richard: Man I don't wanna watch your shit. That seems like a lot of work you know I mean i gotta stand here and do literally nothing except make sure that no one walks away with it.
Tom: Stop being so complainatory and do it.