Pretty simple: Post a character name (and what they're in) and next person does the same with their character's name starting with the next letter of the alphabet.

Start: 

Annabelle in 'Annabelle: Creation'

Willy Wonka from Willy Wonka and the Chocolate Factory

X(A/N)^th  from Piers Anthony's Xanth series

Yoda - Star Wars

Zacharias Smith -- Harry Potter

Angelica Pickles from Rugrats

Boo Boo - Hanna Barbera's Yogi Bear

Castiel from Supernatural

Dexter from Dexter (obviously!)

Edna Mode - The Incredibles

Frank Castle from The Punisher

Galadriel, from Lord of the Rings

Harry from Harry Potter, obvs!

Ichabod Crane, from The Legend of Sleepy Hollow

Josh Nichols from Drake & Josh

Karl from An Idiot Abroad

(captain) Lee from Below Deck

Mickey Mouse.

Nemo from Finding Nemo

Odie - Garfield comic strips

Pongo from 101 Dalmations