Black

Black was a colour.

The Master usually dressed in mostly black clothes. (TV: Terror of the Autons, Frontier in Space, The Deadly Assassin, The Keeper of Traken, Doctor Who, Utopia, Last of the Time Lords, The End of Time, The Doctor Falls, Spyfall)

Davros wore a black leather tunic. (TV: Genesis of the Daleks, Destiny of the Daleks, Resurrection of the Daleks, Revelation of the Daleks, Remembrance of the Daleks, The Stolen Earth, Journey's End, The Magician's Apprentice, The Witch's Familiar; AUDIO: The Juggernauts, et al.)

Black Daleks were identified by their black casings. (COMIC: Duel of the Daleks, TV: The Dalek Invasion of Earth, The Chase, The Dalek's Master Plan, Resurrection of the Daleks, Remembrance of the Daleks, AUDIO: The Juggernauts, Brotherhood of the Daleks, The Apocalypse Element, et al.) Dalek Sec had a completely black casing. (PROSE: Birth of a Legend, TV: Army of Ghosts/Doomsday, Daleks in Manhattan/Evolution of the Daleks)

Cyber Leaders were identified by their black head handlebars. (TV: Earthshock, The Five Doctors, Attack of the Cybermen, Silver Nemesis, Army of Ghosts/Doomsday, The Pandorica Opens, et al.)

The Sontarans wore black space armour. (TV: The Time Warrior, The Sontaran Experiment, The Invasion of Time, The Two Doctors, War of the Sontarans, Survivors of the Flux|The Vanquishers; AUDIO: The Sontarans, Heroes of Sontar, The Five Companions, The First Sontarans, Terror of the Sontarans; COMIC: The Betrothal of Sontar)

The Voord wore black bodysuits. (TV: The Keys of Marinus)

The Trickster normally wore a long black hooded robe and gloves. (TV: Whatever Happened to Sarah Jane?, The Temptation of Sarah Jane Smith, The Wedding of Sarah Jane Smith)

The Ninth Doctor normally wore all black articles of clothing, save for a long sleeve jumper of a different colour, (TV: Rose et al.) though by the end of his life even the jumper he wore was black. (TV: Bad Wolf/The Parting of the Ways)

The First Doctor wore a black town coat. (TV: An Unearthly Child, The Daleks, Marco Polo, The Dalek Invasion of Earth, The Chase, The Dalek's Master Plan, The Tenth Planet, The Three Doctors, The Five Doctors, Twice Upon A Time et al.)

The Second Doctor wore a black frock coat. (TV: The Power of the Daleks - The War Games)

While investigating strange technology in Washington, DC during the 1980s, the Sixth Doctor donned a black suit on Peri Brown's insistence. (PROSE: Blue Box) He also wore a black bow tie. (AUDIO: The Wreck of the Titan)

The Seventh Doctor replaced the Sixth Doctor's rainbow umbrella which he was forced to leave when the First Rani's base on Lakertya was destroyed. (TV: Time and the Rani) with a black umbrella which had a whangee handle. (TV: Paradise Towers) After the first black umbrella was damaged, (AUDIO: The Warehouse) he acquired a new umbrella with an elaborate handle in the shape of a large cherry question mark. (TV: Delta and the Bannermen) Whilst in Nazi Germany, he briefly donned a black leather trenchcoat and a black soft hat. (PROSE: Timewyrm: Exodus) He also wore a black cravat with his dark jacket. (PROSE: St Anthony's Fire)

The Eighth Doctor wore black ankle boots after his regeneration. (TV: Doctor Who). Occasionally he wore a black top hat. (COMIC: The Curious Tale of Spring-Heeled Jack; AUDIO: Other Lives) He also owned a black velvet coat (PROSE: Vanishing Point) that he won in a bet with a member of Faction Paradox. (PROSE: The Book of the War) He also wore a a black waistcoat embroidered with orange designs. (PROSE: The Year of Intelligent Tigers)

The War Doctor wore a double-breast trenchcoat of black leather when he used a molecular fruit bomb to transform the factories of Villengard into a banana grove to prevent it from supplying weapons to Daleks. (COMIC: The Whole Thing's Bananas). (COMIC: The Whole Thing's Bananas)

The Tenth Doctor sometimes wore a black tuxedo and bow tie; though he sometimes sees it as a sign things would go wrong. (TV: Rise of the Cybermen|The Age of Steel, The Lazarus Experiment, Voyage of the Damned)

The Eleventh Doctor once wore a black moleskin overcoat. (TV: A Town Called Mercy) He also wore a black top hat, (TV: The Big Bang, Let's Kill Hitler), a black cravat, (TV: The Great Detective-The Snowmen) and two black waistcoats. (TV: Nightmare in Silver, The Day of the Doctor, The Time of the Doctor)

The Twelfth Doctor wore black shoes. (TV: Deep Breath, etc) He also wore a black waistcoat (TV: Flatline) and sometimes black trousers. (TV: Under the Lake) plain black socks, (TV: Heaven Sent), a black shirt with a white polka dot pattern, (TV: Kill the Moon), a black hoodie, (TV: Last Christmas) and a black Crombie coat. (COMIC: The Eye of Torment; TV: The Return of Doctor Mysterio) After returning to Gallifrey, he wore a black overcoat and waistcoat, dark trousers and black brogue boots. (TV: Hell Bent) He occasionally wore a black velvet frockcoat. (TV: The Pilot, Thin Ice) He also wore a black top hat. (TV: Thin Ice.)

When gatecrashing Daniel Barton's casino themed party, the Thirteenth Doctor wore a black bow tie with golden dots, black capri trousers, black braces, black boots and socks, and a long black moleskin overcoat. (TV: Spyfall)

Martha Jones wore black bodysuits. (TV: Last of the Time Lords, The Sontaran Stratagem, The Stolen Earth|Journey's End, The End of Time).

When attending Daniel Barton's birthday party at the Vallis Estate vineyard, the Thirteenth Doctor, Yasmin Khan, Ryan Sinclair and Graham O'Brien all wore black tuxedoes and bow ties. (TV: Spyfall)

Clara Oswald wore a black leather jacket on occasion. (TV: The Magician's Apprentice/The Witch's Familiar)

Rose Tyler's personal growth during her travels with the Doctor began to reflect itself in her clothing choices as she became more confident and assertive, swapping her jeans for slim black trousers. (TV: The Long Game, Bad Wolf/The Parting of the Ways, New Earth, Fear Her, Army of Ghosts/Doomsday, The Stolen Earth|Journey's End)

On her first day on the job working for Torchwood, Gwen Cooper wore a black blouse. (TV: Day One) During her time with Torchwood Three, she would favour an increasingly black and leather wardrobe.

During Torchwood Three's confrontation with a cyber-converted Lisa Hallett, Toshiko Sato wore a black t-shirt. (TV: Cyberwoman)

Sarah Jane Smith often wore a black leather jacket. (TV: The Monster of Peladon, School Reunion)

Lisa Deranne wore a black tank-top under her white shirt when she and her crew met Sontarans including Commander Steg and Lieutenant Vorn. (HOMEVID: Shakedown: Return of the Sontarans)

The Pied Piper wore a top hat, a bow tie and a waistcoat which were each black when posing as Mr. Spellman, director of Spellman's Magical Museum of the Circus. (TV: The Day of the Clown)

Some individuals wore black lipstick. (PROSE: No Future, Goth Opera, Dry Pilgrimage)

In Through the Eye of Eternity, the Black Eye of Eternity generally symbolised that the week's episode would be a black comedy. One fan wearing a black Eye pin, an apprentice mortician in Shoestring, Indiana, was fired after laughing at a client's sombre remark. (PROSE: The Book of the War)

In an alternate timeline in which the First Doctor spent three months on Urbinia, his friend, Professor Feedlam discovered a new colour which was "a little bit green and a little bit black", creating "a sort of mauve". (AUDIO: Daughter of the Gods)

Biology

The Second Doctor had black hair. (TV: The Tenth Planet)

The Host of the Lupine Wavelength Haemovariform had all-black eyes. (TV: Tooth and Claw) Grace Holloway's eyes turned all-black when she was controlled by the Bruce Master. (TV: Doctor Who) Mercy Hartigan's eyes turned all-black when she was converted into the CyberKing. (TV: The Next Doctor) Owen Harper's eyes turned all-black when he was possessed by Death. (TV: Dead Man Walking)

Nostrovites had black blood, (TV: Something Borrowed) as did the Process. (PROSE: Cat's Cradle: Time's Crucible)

Black roses grew on Florana. (AUDIO: The Elite)

Peter Dickson's mother thought that black cats were unlucky. (PROSE: The Clockwise Man)