Motorcycle Boy

The Motorcycle Boy, whose real name is never mentioned, is Rusty-James' older brother. He is said to have an obsession with motorcycles and is away from home for long periods of time. On a trip to California, he finds their mother who left home when Rusty-James was very young. Everyone likes him. Rusty-James says that people look at him, stop, and then look again. Towards the end of the book, The Motorcycle Boy is in the pet store staring at some Siamese Fighting Fish, which he calls "Rumble Fish", hence the name of the book.