Alessa Gillespie is a pivotal character in the Silent Hill series, appearing as both a victim and a catalyst for the events in the town. 'Memory of Alessa' is a manifestation of her darker memories and pain, serving as an antagonist in Silent Hill 3. This entity confronts Heather Mason, Alessa's reincarnation, forcing her to face traumatic memories. Alessa's torment and supernatural abilities are central to the series' narrative, shaping the psychological horror experienced by the main characters.