Patience Nepath
Patience Nepath was a 19th century human, and Roger Nepath's sister.
When Roger was fourteen, he watched a neighbour's house burn. When Patience came to bring him home, part of the house collapsed and killed her. His guilt led him to steal her corpse from the morgue and keep it with him.
When he made contact with the fire elemental, it promised to resurrect his sister if he would help it spread. He agreed, and brought people like Lord Robert Urton to it so it could possess them and increase its influence.
However, when the Eighth Doctor confronted Nepath and said that Patience had not been truly resurrected, he asked the elemental to abandon her to prove the Doctor wrong. It reluctantly agreed, embracing Nepath as it drained away, leaving only a stone statue. (PROSE: The Burning)