Matron of Honor
Bride's sister since '94. Bride's best friend since '12.
Best Man
The reason Johnny moved to Missouri (sight unseen) was to move in with his childhood friend, Matt. If not for Matt's room availability, and Johnny's disdain for Florida and its residents, Johnny and Katherine never would have met.
Bridesmaid
What can we say about Carina that hasn't already been said? She has held Katherine's Favorite Cousin status for decades, which became even more cemented by a shameless shared love of One Direction. Unfortunately Carina lives all the way in Arizona, but her sarcasm and dry sense of humor (thank you, Grandma Woodruff) can still be felt from across the country.
Groomsman
Though he is one of Johnny's many childhood friends, Katherine had to compete the hardest with Cyrus for Johnny's heart. When the couple once visited Chicago and stayed with Cyrus, Katherine woke up in the middle of the night alone to find Johnny sleeping with Cyrus. You could say they're close.