Marvin Prune is a golden ticket finder in Willy Wonka's factory.
Marvin is described as 'a conceited boy' by Roald Dahl in a 'children intro' manuscript page Roald Dahl kept, part of Charlie and the Chocolate Factory''s third draft.
A (Literally) Missing Child Edit
In 1972, Roald Dahl sent Marvin Prune's exit to The Horn Book Magazine, hoping they would publish it as a 'missing chapter...'. Instead, the magazine printed a work by Elanor Cameron, which almost seemed like an assault on Roald himself, many fans say. Roald never got the chapter back, and its been missing ever since.
Marvin's family is probably made up of himself and his parents, among others.
You can find a fan-made version of Marvin's exit at , made by a creator called Jimmy-C-Lombardo.
1. See DeviantArt link
2. Inside Charlie's Chocolate Factory, By Lucy Mangan, published by Penguin Books.