Fred

The Doctor was a future incarnation of himself first encountered by his seventh incarnation at Bonjaxx's birthday party. It is possible that this was A) The Ninth Doctor dressed up for the party, B) The Eleventh Doctor, with a hair cut, C) Shayde (see Wormwood (comic story)) who was seen at the party, or, as the source suggests, D) a future incarnation of the Doctor.

Biography
Accompanied by his companion Ria, this version of the Doctor greeted his Seventh incarnation and Ace at Maruthea during Bonjaxx's birthday celebration. Though close-mouthed about it, he implied the Time Lords no longer had the power to impose the First Law of Time over him, so that he could converse with his seventh self with impunity. This was most likely due to the destruction of Gallifrey. (DWM: Party Animals)

Appearance
This Doctor had short, dark hair and a receding hairline.

His style of dress leaned toward 1920s-style formal wear, similar to the Eleventh Doctor. His neck-wear of choice was a bow tie. He occasionally wore a jumper or waistcoat.

His outerwear consisted of a dark suit jacket with light-coloured piping along the lapels, and he carried a toothbrush in his outer breast pocket for reasons unknown. He also sometimes wore a badge shaped like a teapot. (DWM: Party Animals)

Other information

 * In an alternate timeline, this incarnation of the Doctor may have committed suicide and regenerated into a woman to hide from the Time Lords. (BFDWU: Exile)

Audio Visuals
This incarnation of the Doctor, played by Nicholas Briggs, first appeared in The Time Ravagers, the second of the AudioVisuals series of fan audio plays. The opening of the story portrayed the previous AudioVisuals version of the Doctor regenerating into him.

During the course of the AudioVisuals story Planet of Lies, the Daleks destroyed Gallifrey. When this version of the Doctor met the Seventh Doctor, he obliquely hinted at this.

In illustrations of this Doctor, this Doctor's physical appearance is modelled on that of Briggs himself. His costume was initially designed by Paul Lunn to resemble "a guy returning from an all-night party in the 1920s." 

Other appearances
Gary Russell, the writer of the Doctor Who Magazine comics story Party Animals, had previously worked with Nicholas Briggs on the Audio Visuals series and had his Doctor appear in the story.

Though not explicitly identified as the same version of the Doctor, Nicholas Briggs also played the Doctor in a flashback sequence in Exile as the current Doctor's past incarnation.

Briggs' Doctor also had a cameo in The Dalek Masterplan, a stage play adaptation of The Daleks' Master Plan, which starred Nick Scovell as an original incarnation of the Doctor and Briggs as the voice of the Daleks. The play concluded with the use of the Time Destructor, which forced the Doctor's regeneration into a new incarnation played by Briggs.

A false incarnation of the Doctor appearing in DWM: The Final Chapter and DWM: Wormwood was modelled upon this Doctor.