(Capcom's primary storyline)
Lucas Baker was a resident at the so-called "Dulvey Haunted House", a large house in the Southern United States. He was the son of Jack and Marguerite Baker. He was allegedly a "bad seed", as stated by Andre Stickland to Peter Walken while filming for their show at the residence before their deaths.
A trailer released during Tokyo Game Show 2016, shows him heckling the player character as his parents insist the character eat with them. This behaviour triggers Jack to violently cut his arm in order to chastise him, in what was apparently a regular occurance.