Celsius

Arani Desai's mother died during childbirth and her father scientist Ashok Desai blamed her for the death of his wife. Arani's father had little to do with her and she was raised by servants and nannies until she ran away. For years, Arani lived a life of poverty in Calcutta until she was rescued by Niles Caulder, the Chief of Doom Patrol, who later married her and as a gift her gave her a dose of the immortality serum. Soon after, Arani discovered her amazing powers- to manipulate and control her core temperature in harmony with martial arts.

Separated from Caulder for several years, Arani learned that he had died at the hands of General Immortus. Obsessed with the idea that the Chief was still alive, Arani assembled a new Doom Patrol to find him, as well as to protect herself from the ancient General Immortus, who had also learned that  Arani was actually Mrs. Caulder and knew about the Chiefs immortality serum.

Mr.s Arani Desai Caulder was isolated and found it hard to associate with others while still providing secure leadership for her Doom Patrol.

Aliens invaded earth and Celsius apparently died while being engulfed in flames from the Gil'Dishpan Battle Cruiser in a battle to save Atlantis. It has yet to be seen whether this was actually a ruse to escape her estranged Niles Caulder, as her immortality and fire manipulation powers both would have allowed her to survive.