Unless they're extremely well known and popular I usually only get introduced to a comedian through radio shows and podcasts that I listen to. Patrice O'Neal will always be the funniest person of all time to me. I couldn't possibly do him any justice by trying to explain how special he was both as a comic and as a person. Bill Burr is probably my favorite comedian alive today with Jim Jefferies and Louis CK being not too far behind him. Oh and Colin Quinn!
Margaret Cho and Eddie Izzard. I don't really know what to say beyond just mentioning some of their jokes and laughing to myself. Okay, well, might as well do that. So, because of Margaret Cho, I use the term "celebrate" as a euphemism now. (Google her joke about the persimmon diet.) I also often say "Do you have a flag?" when someone asks for something or says something is theirs. I dunno. It feels dumb saying these things, but they're kind of like an inside joke, I guess.
I love Russell Peters because he represents Canada! and racist jokes are funny. Also, Godfrey because he is hilarious AF XD Also, Ricky Gervais because atheism. Also, Dave Chappelle, because grape drink. Sugar + water + purple.