1. Looks like
1.1. Chapter 28, page 290
1.1.1. Stubble
1.1.1.1. It represents where he comes from which is across from the town dump ie. away from centre of Maycomb.
2. Motivated by...
2.1. Chapter 17, page 184
2.1.1. Hatred towards Tom
2.1.1.1. Bob refers to Tom as "some nigger" rather than addressing his name or calling him "nigger" (which would still be bad). An offensive or racist term used to describe black people.
3. How others see him
3.1. Chapter 22, page 239
3.1.1. Poor mannered
3.1.1.1. Bob Ewell spat in Atticus' face whilst chewing tobacco.
3.2. Chapter 28, page 294
3.2.1. Ruthless
3.2.1.1. "Bob Ewell's lyin' on the ground under that tree down yonder with a kitchen knife stuck up under his ribs. He's dead, Mr Finch." -Mr. Heck Tate
3.2.1.1.1. He was so fixated on getting revenge that it didn't matter to Bob about the circumstances that he was putting himself in.
3.3. Chapter 3, page 29 Chapter 18, page 202-203
3.3.1. Poor care of his children
3.3.1.1. "Burris [son of Bob], I want you to go home and wash your hair with lye soap. When you're down with that, treat your scalp with kerosene" -Miss Caroline
3.3.1.1.1. This shows Bob lack care towards his children's well being.
3.3.1.2. Atticus asks if Mayella loves her father and she says he is tolerable except for when he drinks.
3.3.1.2.1. This demonstrates that Bob has little to no affection towards his children, due to the fact that Mayella admit to loving her father because of this.
4. Beliefs & Values
4.1. Chapter 23, page 240 Chapter 20, page 221
4.1.1. White superiority over blacks
4.1.1.1. Bob has just spat in Atticus' face, and challenged him to a fight. After Atticus' cool demeanour, Bob says "Too proud to fight, you nigger-lovin' bastard?"
4.1.1.1.1. By saying "nigger-lovin'", Bob believes that white people are superior to blacks. He uses this term to degrade blacks, and does so in an offensive way.
4.1.1.2. Scout and Dill are speaking to Mr Raymond outside the courthouse. Mr Raymond explains why isn't drunk. He says "I'm not much of a drinker, but you see, they could never, never understand that I live that I live like I do" - because he prefers life with black people.
4.1.1.2.1. When Mr Raymond says "that I live like I do" and that "they would never understand", he refers to people like Bob, who don't think that white people and black people do not mix.