In Season 2, Sean Wallace is deeply affected by the events of the first season, particularly the death of his father, Finn. He is driven by a desire for revenge and to reclaim his family's power. Throughout the season, Sean struggles with his identity and the violent world he inhabits, leading him to make increasingly ruthless decisions as he seeks to establish control over London's criminal underworld.

Sean's relationship with his mother, Marian, becomes strained in Season 2 as they navigate the aftermath of Finn's death. Marian is protective of Sean but also critical of his violent methods. Their interactions are filled with tension as Sean's quest for power clashes with Marian's desire for a more stable and less violent life, highlighting the emotional turmoil within their family.

Ed Dumani, portrayed by Lucian Msamati, plays a pivotal role in Season 2 as he attempts to consolidate power amidst the chaos following Finn's death. He is portrayed as a cunning and strategic player in the criminal landscape, often manipulating situations to his advantage. His motivations are driven by a desire for respect and control, leading to complex interactions with other characters, particularly Sean and the Dumani family.