Legacy
During the period when he was searching for the original Clara, the Eleventh Doctor painted a detailed portrait of the Clara Oswin Oswald echo.
Rigsy later painted a memorial for her on the TARDIS doors, which included a portrait of Clara. It was still there when Clara and Ashildr dropped off the TARDIS in Nevada for the Doctor, but the Doctor had now forgotten her. As the TARDIS dematerialised, the mural he painted disintegrated, though some flakes of paint remained from the portrait.
After Clara's death, the Twelfth Doctor continued to speak to her and ask her what she would do while he was inside his confession dial. He had hallucinations of writings on the TARDIS blackboard writing by itself and briefly, an apparition of Clara herself. She told the Doctor to "Get up off your arse, and win." A "very old" painting of Clara also appeared inside the tower in the Doctor's confession dial.
While visiting the diner in Nevada, the Doctor began playing a melody that he apparently composed. The song, he said, was titled "Clara". Later, Clara suggested that some memories become songs when they are forgotten, in reference to this piece of music.
When a Time Lord author reflected on the events surrounding the coup against Rassilon and the Doctor's latest absconding of Gallifrey, he theorised that the Doctor's love for Clara caused the two of them together to be the Hybrid of Gallifreyan legend.
While the Doctor recalled saving Jess Collins' life in Highgate Cemetery and having prevented the Corvids from being unleashed on Earth, he failed to remember that Clara was with him at the time. Jess mentioned that if it wasn't for the Doctor and Clara, Jess would be dead. The Doctor was also unclear as to who Jess was referring to when she asked him where Clara was.
The Twelfth Doctor specifically noticed the name "Oswald. C." on a Roll of Honours board at the renovated Coal Hill Academy.
Clara's association with the Doctor was such that when Sonny Robinson created Time Surgeon, based on urban legends about the Doctor, the eponymous character's assistant, Nurse Kara, was based on Clara.
Somewhat contradictorily, a character called Clara appeared in the BBC science fiction/drama series, Doctor Who.
Whilst communicating with his previous and immediate future selves via the TARDIS' telepathic circuits, the Twelfth Doctor responded with bewilderment upon hearing the Eleventh Doctor mention Clara.
When the Doctor was about to wipe the memories of Bill Potts, Bill asked how he would feel if someone did it to him. The Doctor then told Bill to leave before he changed his mind before later inviting her to join him on his travels. Shortly before regenerating, the Doctor briefly recalled Clara's face, without knowing whose face it was.
Clara, along with Willa Twiston and Ashildr, became one of the Three Norns or Fates of mythology.
The Encyclopedia Gallifreya contained files on Clara and all of her splinters directly encountered by the Doctor.