Arthur is a senior member of the Van der Linde Gang. He was taken under Dutch's wing at a young age and serves as his right-hand man and lead enforcer.
Arthur spent time riding alongside Dutch and led him to claim the outlaw life as his own, along with Dutch’s vision of a life lived free from the governments rule of law. This loyalty makes him one of the few people Dutch really trusts. However, it is revealed that Arthur is going through an "existential crisis", where he begins to develop skepticism regarding Dutch's ideologies and motives as the gang grow more notorious in status over time.