Margaret Atwood, Zadie Smith and Ian McEwan are among a number of literary stars auctioning off the chance for readers to name characters in their next novels to raise money for survivors of torture.

The auction is part of Freedom from Torture’s 10th anniversary literary festival, which brings together leading authors and survivors for a celebration of storytelling, featuring a poetry competition and live readings at the London Library on 11 November.

More than 75 authors, poets, artists and illustrators are supporting the festival, with other prizes including original artwork by Quentin Blake, a rare book of Mary Wollstonecraft stories illustrated by William Blake, and a book club visit from the author Louise Doughty.

A bookmark raffle will feature more than 30 original designs by authors, each paired with a signed copy of the book that inspired it.…