Fitz Kreiner

Fitz Kreiner was a companion of the Doctor.

The "original" Fitz
Fitz Kreiner was born to Otto Kreiner and Muriel Kreiner in 1936. Before meeting the Doctor and Sam he worked in a florist’s shop. Fitz lived in a small third floor flat in Archway before he met the Doctor and Sam. Fitz was an excellent guitarist, but performed under the name Fitz Fortune so as not to highlight his German heritage. (EDA: The Taint)

When the Doctor, Sam and Fitz landed on Earth in 1996, 3-4 distinct varieties of Fitz Kreiner were brought into existence. Fitz was placed in The Cold by the United Nations in 1996 in Geneva and was removed from it in 2593 on Ordifica. Here Fitz decided since he is so far removed from the Doctor and his own time to become an agent of Faction Paradox. (EDA: Interference - Book One)

Upon joining the Faction Paradox Fitz along with other survivors of Ordifica were taken back in time and placed on Anathema by the Faction Paradox to become their troops; The Remote, Fitz became part of their society, without totally becoming a part of it in the literal sense. During his time on Anathema he contemplated suicide, but ultimately didn’t. He did however join the Faction Paradox and was indoctrinated into its ranks.

Before leaving Anathema, Fitz placed his memories in a Remembrance Tank, which molded a replica of himself out of Biomass, so that his memories and personality would continue to live on in the Anathema. Fitz, or rather the re-remembered version of Fitz lived on Anathema for over 500 years on their journey towards Earth. The re-remembered version of Fitz became Kode, who came to Earth selling The Cold with Compassion and Guest.

The Doctor recognised elements of Fitz’s personality in Kode and offered to use the TARDIS’s telepathic circuits to re-remember Kode as the Fitz who joined the Doctor in 1963, and as the man he was up to the point that the TARDIS lost contact with him (when he was placed in The Cold, or there abouts). (EDA: Interference - Book Two)

Following his Re-Remembering
Fitz travelled with the Doctor and Compassion to Gallifrey where he tried to prevent Faction Paradox from invading. Gallifrey was destroyed by the Doctor and Fitz was picked up by Compassion and deposited on Earth to meet the Doctor in 2001. (EDA: The Ancestor Cell, Escape Velocity)

Fitz once claimed to be the true hero between him and the Doctor in an affort to collapse the corrupt organisation Alien Defense Incorporated. (BFA: Fitz's Story)

Some of Fitz's memory after the destruction of Gallifrey had been destroyed, but to a far lesser degree than the Doctor's. (EDA: Escape Velocity) Fitz soon regained his memories but never told the Doctor due to the Doctor wanting to move on from his previous life. (EDA: Halflife) Fitz developed a relationship with fellow companion Trix and planned to leave the Doctor after they defeated the Vore. (EDA: The Gallifrey Chronicles)

Pre-Re-Remembering
Fitz suffered from a bit of the 'comic book' syndrome; he thought that he was special if only someone would notice. (EDA: Demontage)

He thought most people stupid and would tell such tall tales as J.R.R. Tolkien having been born between 'R.J Tolkien' and a prostitute called Frodo. (EDA: The Taint)

He also liked to play up the character of various fictional characters from movie and novels such as James Bond.

Fitz slept with a dark haired Samantha Jones. (EDA: Unnatural History)

Post-Re-Remembering
Fitz; after re-remembering by the TARDIS appeared to be more at ease with himself, more attuned to the ways of the TARDIS and travelling through time.

Fitz Kreiner enjoyed tea, and sorely missed the TARDIS's supply of tea when the TARDIS was thought to be destroyed in the dimensional barriers between Avalon and Earth. (EDA: The Fall of Yquatine)

Following the Doctor's 100 years trapped on Earth, Fitz knew more about the TARDIS and in fact the Doctor's life than the Doctor himself, and even demonstrated an affinity with the TARDIS in keeping things (such as the Doctor's memories) from the Doctor. (EDA: Escape Velocity, EarthWorld, Trading Futures).

He had an affinity for forming friendships, first with Sam and then the Doctor, and later (although they were reluctant to admit it) Compassion and Anji.

Over time he developed a number of Doctorish traits, such as taking the lead in investigations into the unknown and taking great pride in providing expert commentary as well as a love of travel.

He described the Doctor as being a pain, but admitted to missing him when he wasn't there. Fitz did not completely trust the Doctor believing that he could have stolen the body of Richard Harries from Banquo Manor. (DW: The Banquo Legacy)

Fitz smoked a lot of cigarettes, and drank just as much. (EDA: The Gallifrey Chronicles)

Appearance
Fitz donned a leopardskin suit with snakeskin shoes whilst in Las Vegas. (EDA: Mad Dogs and Englishmen) He once wore a wide-brimmed hat along with the Doctor. (EDA: Camera Obscura)