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By most accounts, the Doctor's ninth incarnation was the one which followed the Eighth Doctor's regeneration.

When examining the Doctor's timeline, Marnal exclaimed to Rachel that the Doctor had "three ninth incarnations". (PROSE: The Gallifrey Chronicles) The Eighth Doctor's visions of his future included a number of potential ninth bodies, (PROSE: The Tomorrow Windows) and accounts differed as to which one he eventually regenerated into. (TV: Scream of the Shalka, The Name of the Doctor, et al.)

After the Eighth Doctor saw several visions of his future in the Tomorrow Window, a single figure solidified out of the blur: a gaunt, hawklike face that gave him a broad, welcoming grin. (PROSE: The Tomorrow Windows)

By one account, the Doctor's "ninth body" was a man who travelled with his companion Emma before deciding to retire from adventuring.

. The Eighth Doctor saw him in the Tomorrow Window as a "listless-looking" man sitting in a medieval dungeon.

By another account, the Doctor's "ninth life" was a man who traveled in the TARDIS with a cyborg version of the Master. (TV: Scream of the Shalka) He had a high forehead and sunken eyes, and the Eighth Doctor thought of him as an aristocrat. (PROSE: The Tomorrow Windows)

The Warrior
By some accounts, the Eighth Doctor regenerated into an incarnation who renounced the title "Doctor" while fighting in the Last Great Time War. (TV: The Night of the Doctor, The Name of the Doctor, et al.)

Others
One possibility was that the Eighth Doctor's successor was another of the four surviving elementals, (PROSE: The Tomorrow Windows, The Gallifrey Chronicles) the Minister of Chance. According to one account, after the Seventh Doctor's death, (TV: Death Comes to Time) the Minister began to fight injustice and cruelty throughout the universe. (AUDIO: The Broken World, et al.)

Another possibility was that the Eighth Doctor's future included many men in pseudo-Edwardian dress as well as the First Doctor. (PROSE: The Tomorrow Windows) By one account, the old man and young girl who landed their spaceship in the junkyard at 76 Totter's Lane were Soul and Zezanne in the shape-shifting Jonah; in their amnesiac states, Zezanne believed that Soul was her grandfather. (PROSE: Sometime Never...)

Other possible successors to the Eighth Doctor were incarnations which the Doctor already knew lay in his future: a ginger incarnation (PROSE: The Tomorrow Windows) whose adventures intersected the Seventh Doctor's several times; (PROSE: Battlefield, Transit, Birthright, Happy Endings) and the Valeyard, who repeatedly menaced the Sixth Doctor (TV: The Mysterious Planet, AUDIO: The Brink of Death, et al.) and was described as an amalgamation of the Doctor's darker sides from between his twelfth and final incarnations. (TV: The Ultimate Foe)

Other possibilities included a figure in a velvet suit and eyeliner and a man with curly hair and a lopsided smile. (PROSE: The Tomorrow Windows)

Ninth Doctor 1 (The Tomorrow Windows) A stockily built figure in a crushed velvet suit and eyeliner stared arrogantly into the distance. (Eddie Izzard)

Ninth Doctor 2 (The Tomorrow Windows) A scruffy student with unruly, curly hair shrugged and smiled an apologetic, lopsided smile. (Alan Davies)

Ninth Doctor 4 (The Tomorrow Windows) An aristocrat with a high forehead and devilish, shadow-sunken eyes sucked on an asthma inhaler.