Maid of Honor
Rachel has known Becca her whole life. But like really, probably down to a few hours. The two have always been very close, so close that Rachel would give a swift, strong kick backwards, to teach Becca not to walk too closely behind her as she followed Rachel everywhere. Becca followed Rachel to UC Davis, where Rachel introduced Chris to Becca. So really this wedding is all thanks to her.
Best Man
There should be little confusion who Chris's Best Man is: the blonder, more muscular, 6'3'' walking tribute to "Be careful picking on your little brother", whose only known weakness is rescued pitbulls. The most useful person Chris knows; in the event of the zombie apocalypse, Tom is definitely the first person you want on your team.
Bridesmaid
Alison and Becca became friends their second year at UC Davis at a lacrosse party themed Under the Sea. While in turquoise sequins, the song "Lip Gloss" by Lil Mama came on and the rest is history. Even their stuffed animals, DogDog and Ginger, are best friends.
Groomsman
College roommate, globe-trotting adventure pal. The Dr Grant to Chris's Ian Malcolm, or maybe the Dr Strange to his Tony Stark. Full time wolf scientist, part time purveyor of extinct relics. Knows more interesting things about more interesting things than most; definitely the second person you want on your zombie apocalypse team.
Bridesmaid
Haneen and Becca became best friends in kindergarten at Clifford. Haneen loves to tell the story about how on Best Friends Day, Haneen picked Becca to be in her photo, but Becca did not pick Haneen to be hers. Now they have been friends for over 25 years.
Officiant
To put it plainly, Linda is Chris's brother's wife's mother. But she is so much more than that. Linda and the rest of the Roth family (yes, even Hank) warmly welcomed Becca and Chris into their family, hosting them for the most delicious Thanksgiving for the past few years.