Lolita

Lolita was an evolved Type 45 TARDIS that had previously belonged to the Master.

Biography
Lolita was present during the Time Lord's war with the Yssgaroth, she may have been infected by it during this time. (FP: The Book of the War, Toy Story)

Under the Master's control, Lolita claimed that he had partly severed her symbiotic relationship with him to allow him to use other TARDISes.

After being freed from the Master's control, Lolita attempted to recruit the Doctor's TARDIS to House Lolita in the years before the War began. (FP: Toy Story)

Lolita created House Lolita to oppose Faction Paradox in the early years of the the War. She entered an alliance with House Tracolix and the Sontarans to destroy the Eleven-Day Empire. During the invasion, Lolita turned on her allies and killed the entire Seventy Ninth Sontaran Assault Corps. After this Lolita swallowed the Eleven-Day Empire into her internal dimensions, killing the majority of Faction Paradox in the process. (BBV: The Eleven Day Empire, The Shadow Play)

Lolita refused to allow any other lifeform to join her house. She claimed that the places were reserved for her future children, who like her were TARDISes. (BBV: In the Year of the Cat)

During the Second War in Heaven, Lolita consumed the Eleven-Day Empire while under orders from the Time Lords to destroy Faction Paradox. Later she betrayed the Time Lords and consumed the War King of Gallifrey. In doing so she became the War Queen. (FP: Words From Nine Divinities)

After becoming the War Queen, she allied herself with Sutekh against Faction Paradox, Anubis and the Time Lords. When Eliza gave her own body to complete Horus as a final attempt to defeat Sutekh, Lolita cut her wrist and put her own biodata in Eliza. This let Lolita control Horus, and she gave the final blow against Sutekh. (FP: Ozymandias)

However, Lolita had just forgotten one detail; Cousin Justine of Faction Paradox had a safe path to Gallifrey, and she led the Mal'akh to attack the Council chambers and Lolita herself directly. After Justine managed to take over Gallifrey, Lolita was trapped in a pyramid by the Osirians as punishment for her crimes. (FP: The Judgment of Sutekh)