Three years after Cortana's death, John-117 has been mourning for quite a while. After Catherine Halsey creates a new AI just for him, he then halts his melancholy. Aya, said to be 'Cortana's daughter' finally cheers him up. She doesn't have all the memories of her 'mother,' but she acts like a nine-year-old daughter. John makes a vow to always protect her, and will go through the fiery pits of hell to keep Aya away from harm... but is she really the one in danger? Picture from DeviantArt.