What chacteristics do we know about the attacker in to kill a mockingbird?

In "To Kill a Mockingbird," the attacker is Bob Ewell. He is described as a menacing and aggressive character who harbors racial prejudice and a vendetta against Atticus Finch for defending Tom Robinson in court. Bob Ewell is ultimately revealed as the one who physically assaulted Jem and Scout towards the end of the novel.