Ruby S
From Tardis Wiki, the free Doctor Who reference
Ruby S was an individual mentioned in the Fifteenth Doctor's diary, although her surname was obscured. (PROSE: First Day of the Doctor [+]Loading...{"page":"31","1":"First Day of the Doctor (short story)"})
Behind the scenes
The character's name was only visible as "Ruby S" in First Day of the Doctor, however other non-fiction included in the annual and concurrent promotional material revealed her full name to be Ruby Sunday.
