Man of Honor
Kody is Tara's best friend from college. They speak to each other almost exclusively in LOTR quotes and Kingdom Hearts references. Kody's literally the nicest guy on the planet. Yes, even nicer than Zach. For example, he's going above and beyond the call of duty and even officiating the wedding. (My, what a guy, that Gaston!)
Best Man
Every wedding has a Best Man, but every Best Man wishes he were a Nick Kill. We would tell you more, but that's strictly classified. Just kidding - Nick is pretty great. He was born and that's how he and Zach met. He does cool things like jump out of airplanes and he can probably incapacitate you with a plastic spork.