Aya Drevis is a fictional character from the visual novel game series called Mad Father. She is depicted as a young girl with a strong bond to her father, who is a scientist involved in dark experiments. The story revolves around her journey to uncover the truth about her family's past and the sinister activities taking place in their home. In the game, Aya is characterized by her determination and bravery as she navigates through a haunted mansion filled with eerie creatures and puzzles. The narrative explores themes of love, loss, and the consequences of unchecked ambition, making Aya a compelling protagonist in this horror adventure.