Doon Harrow from The City of Ember is Lina's friend. He is gifted with a very analytical mind and he is able to figure out how to make most things run. He is hoping to be assigned to a work station where he can make a difference and save Ember, but in the end, the give him the job as messenger (which is a waste of his talents). He openly speaks out against the Mayor (who is very corrupt). When Lina tells him that she plans to leave Ember, he is with her 100%. He helps her iron out the details and take care of Poppy when they leave.