Maid of Honor
Allison and Caitlin were college roommates and quickly bonded over Miyazaki films and video games. She was there for Allison during some of the hardest moments of her life and is counted as her dearest friend.
Best Man
Glenn is first and foremost, obviously, Shane's brother. He's also, singlehandedly, the only reason Shane had friends during high school. The only person to make Shane turn to violence, as well as one of the people he cares about the most.
Bridesmaid
The only other girl cousin on the Holloway side of the family, Lindsay was the de facto coolest cousin ever (sorry guys). She had cats and did science and Allison thought this was the greatest combination to ever exist. When Shane and Allison moved up to the Boston area in 2015, she was a stone's throw away and readily opened her home and family to them.
Groomsman
College roommate and best friend. Aaron and Shane weren't immediately friends, but living in the same room as someone tends to make you like them, or hate them. They bonded over their love of sports, beer, and the different ways Shane could make an ass of himself.
Bridesmaid
Hannah is Shane's sister, and has made Allison welcome in the family since day one. Hannah and Allison have both tortured their brothers with their obsessive qualities when it comes to movies. Her name is a Palindrome.
Groomsman
Childhood friend to both Nace brothers, he introduced Shane and Glenn to video games, as well as all sorts of other fun nonsense. Meetups happen less frequently now, but as Ryan said before his own wedding, it's always good to have quality time between the three of us.