Biography: From Chapter 1 of Voyage of the Dawn Treader:

There was a boy called Eustace Clarence Scrubb, and he almost deserved it. His parents called him Eustace Clarence and masters called him Scrubb. I can't tell you how his friends spoke to him, for he had none. He didn't call his Father and Mother "Father" and "Mother", but Harold and Alberta. They were very up-to-date and advanced people. They were vegetarians, non-smokers and teetotallers and wore a special kind of underclothes. In their house there was very little furniture and very few clothes on beds and the windows were always open.

Eustace Clarence liked animals, especially beetles, if they were dead and pinned on a card. He liked books if they were books of information and had pictures of grain elevators or of fat foreign children doing exercises in model schools.

Eustace Clarence disliked his cousins the four Pevensies, Peter, Susan, Edmund and Lucy. But he was quite glad when he heard that Edmund and Lucy were coming to stay. For deep down inside him he liked bossing and bullying; and, though he was a puny little person who couldn't have stood up even to Lucy, let alone Edmund, in a fight, he knew that there are dozens of ways to give people a bad time if you are in your own home and they are only visitors.