The first being the Yth Doctor I designed for the Legacy of Rassilon project (Here), he's intended to be used for free by fans in their own stories anyway. His adventures could revolve around a "searching for a a mysterious item of Time Lord origins" (AKA a Legacy of Rassilon) story arc.
The second is a sort of mystical "Tolkien-esque" Leprechaun type of Doctor, with a whimsically child-like personality masking a sinister, manipulative and even borderline malevolent streak to their personality. (Much like Patrick Troughton or Sylvester McCoy's Doctors but turned up to a hundred).
And the final one is a kind-of-intended-for-the-SUXDW-Universe Doctor who's a bit of a dark-humoured and melancholy type with a penchant for gothic aesthetics (Basically like the Shaka Doctor but female and without a robotic version of the Master for company.)