Pauline Fowler

Pauline Fowler was, according to different accounts, either a character on EastEnders, (PROSE: The Monsters Inside) or a real individual who lived on Albert Square in Walford. (TV: Dimensions in Time)

In 1973, the real Pauline was chatting with her sister-in-law Kathy when Susan met the Sixth Doctor outside the Queen Vic pub. 40 years later, the two ladies met the Third Doctor and Melanie Bush. (TV: Dimensions in Time)

In the video game Happy Deathday, played by Izzy Sinclair on the Time-Space Visualiser, Pauline reacted with displeasure when she witnessed the Third and Fifth Doctors battling Sontarans on Albert Square.

Other references
When tested by Lazlee Flowers on tangential warp offset, the Ninth Doctor reminded Rose Tyler of the address of Pauline, Martin and Sonia Fowler, leading her to give the answer 45. (PROSE: The Monsters Inside)

Behind the scenes
In EastEnders continuity, Pauline died in 2006, while Dimensions in Time shows her still alive in 2013. Wendy Richard had passed away herself by 2009.