The 13th Doctor (VFDW)

"I don't know who I am. Am I a good man? Am I a bad man? Or am I somewhere in between? I don't know where or when I am, and I don't know why you people call yourselves a fire department, but one thing I do know: You'll be getting plenty of Volunteer Factual Dispatches from this Time Lord!"

 was a Time Lord from Gallifrey. he ran away in a TARDIS. He's freed Ood, destroyed Wirrn, come head to head against Cybermen and head to whatever you call the tops of the containment suits with Daleks, and led 13 consecutive lives. Now, as he expects to die, he finally makes it....

Biography
The Brown Guardian, lord over all living forms, was being held in a Time Lord prison by the Black Guadian, and the 12th Doctor tried to stop it. However, all life on the planet without sentience was after him, and the humans were having trouble getting it out of their heads. The plant and animal life overrun the TARDIS, and it became a jungle inside. A wolf pursued him to the pool, where it bit and tore, and the Doctor fell dead into the water.

Early life
Centuries later, the animals had all left or died or mated. The pool water was dirty, everything was cracked or stopped from the plants still living, and the outside was mossy and vine-covered. The 12th Doctor had begun the regeneration process already, as his hair was getting redder and he was allergic to pollen, and that was what jump-started the next stage. He breathed. And a pollen particle was sucked a little closer to his nose, and drifted in. His nose blew, spewing regeneration energy, and soon his hands and head were jetting it everywhere. When the mist cleared, we had this guy. He got up, ran to the console room, shooed a mouse out of the hole that contains new sonic screwdrivers, and one shot up immediately. He used it to activate the rest of the TARDIS, and was on his way.

Career
He went about his career of time travel, but as usual, the TARDIS went right where he was needed - a house that burned, 10 minutes before being burned. He drove his old car out, and motioned for three children to come out so that they would survive the fire, and lead on their miserable lives, which would be documented by one Lemony Snicket. Soon he met the real VFD, and became a volunteer of sorts. He put out all fires throughout history that could be changed, so not really famous ones but other ones you probably don't know.

Personality and traits
He is very light-hearted when he's not being sulky, then of course that's not much, and he also is very eccentric and, well, kind of a mad man.