Clara Oswald/Other realities

Alternate counterparts of Clara Oswald existed in other realities. These individuals shared similarities with Clara from the Doctor's universe, despite existing in parallel universes or alternate timelines.

Journey to the Centre of the TARDIS
In one ultimately-undone sequences of events, Clara Oswald was lost inside the TARDIS when it was caught in a magnetic hobble-field from a space salvage ship, operated by the Van Baalen Bros.. The TARDIS was severely damaged and the engines had become unstable due to time leakage triggered by the incident. The Eleventh Doctor, with the help of Gregor, Bram and Tricky Van Baalen found Clara, and the group went to the engine room to fix the problem. While travelling through the Eye of Harmony, the quintet were trapped inside by their future selves. Clara's cells liquified and her skin burnt. She transformed into a time zombie - one of the very creatures that had trapped her. (TV: Journey to the Centre of the TARDIS)

Four Doctors (Voord timeline)
In one timeline, Clara betrayed the Twelfth Doctor following the demise of Danny Pink. The Doctor refused to forgive Clara and evicted her from the TARDIS. Without her influence however, the Doctor was consumed by his grief and loneliness, leading him to ally with the Voord. Though still hurt by her betrayal, Clara remained very important to the Doctor, who was delighted to meet an alternate version of her.

On a jungle planet, Clara found a museum that held a record of the Tenth, Eleventh and Twelfth Doctors meeting. Seeking to prevent the dangerous paradoxes of a Multi-Doctor Event, Clara steered the TARDIS to Paris in 1923 to enlist the aid of Gabby Gonzalez and Alice Obiefune only for her preparations to enact the event itself and draw the Reapers to them. After outrunning the predators, the six travelled to the planet Marinus where they fell victim to a continuity bomb, being deposited in a timeline where the Twelfth Doctor had been driven mad with grief and joined the Voord. Intending to ensure his existence, the alternate Doctor imprisoned Clara and his three other selves, planning to wipe their memories and deposit them at the correct times for his plan to work. This timeline was undone when Gabby used a Weeping Angel to return to the original Parisian meeting and warn their past selves. (COMIC: Four Doctors)

The Daft Dimension
to be added

Other
A version of Clara who never died facing the Quantum Shade existed in a timeline visited by Same and Different. (PROSE: The Paradox Moon)