Fred

The Doctor encountered a future incarnation of himself at Bonjaxx's birthday party. In his next incarnation, the Doctor had Shayde impersonate this incarnation for him.

Profile
Accompanied by his companion, Ria, this version of the Doctor greeted his incarnation and Ace at Maruthea during Bonjaxx's birthday celebration. Though close-mouthed about it, he implied that 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. (DWM: Party Animals)

Later, to fool the Threshold, the Doctor faked his own regeneration, having Shayde take his place and pretend to regenerate into this version of the Doctor. (DWM: The Final Chapter, Wormwood)

This Doctor displayed a particular fondness for tea.

Appearance
Physically, this Doctor had dark hair with a receding hairline.

His style of dress leaned toward 1920s-style formal wear. His neckwear of choice was a bow-tie. He occasionally wore a jumper or waistcoat.

Hos outerwear consisted of a dark suit jacket with light-coloured piping along the lapels, and was known to carry a toothbrush in his outer breast pocket. His buttons were occasionally emblazoned with question marks.

Other information
This incarnation of the Doctor, traveling alone, may have developed amnesia and re-named himself Fred. (BBV: Cyber-Hunt, Vital Signs)

Audio Visuals
This incarnation of the Doctor originated, played by Nicholas Briggs, first appeared in Time Ravagers, the second of the AudioVisuals series of fan audio plays. The opening of the story showed the previous AudioVisuals version of the Doctor regenerating into him. During the course of the AudioVisuals story Planet of Lies, the Daleks succeed in destroying Gallifrey. When this version of the Doctor meets the Seventh Doctor, he obliquely hints 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.

This version re-appeared as a false ninth incarnation of the Doctor in the climax to Fire and Brimstone and for Wormwood, as a way to bluff the readership of the comic into believing that the Doctor Who Magazine's editor had really done the unthinkable and gotten rid of the Eighth Doctor.

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. The play concluded with the use of the Time Destructor, which forced the Doctor's regeneration into a new incarnation played by Briggs.

The Wanderer/Fred
Nicholas Briggs appeared as "the Wanderer" or "Fred" in the BBV audio stories Cyber-Hunt and Vital Signs. Implicitly, these continue the adventures of the AudioVisuals Doctor past the concluding story of the productions.