Charles Dickens was a famous English novelist and social critic who wrote during the Victorian era. He is best known for his works such as 'Great Expectations' and 'A Christmas Carol'. He also used several pseudonyms throughout his career, including BOZ (3 letters), Elia (4 letters), and Dora (4 letters). BOZ was the pseudonym he used for his early works, such as 'Sketches by BOZ', while Elia was the name he used for his contributions to the London Magazine. Dora was the name he used for his last novel, 'Our Mutual Friend'.