The following characters are transported to the Song of Ice and Fire Universe by a reality warper. they must contend with each other as well as existing players e.g. Tyrion, Varys, Little-finger, Olena Tyrell etc. The character's are placed in mediocre families but not astoundingly low. Houses such as Florent, Tarly etc. Morals on.
EDIT: All have a strong desire to ascertain the throne itself.
NBC's Dr Hannibal Lecter
Dr Gregory House
DCI John Luther
A prince from the Summer Isles, he is well liked and respected as a warrior and politician, and loved by the smallolk with an army of fifteen thousand men. [Just to give him an edge due to the racial barrier]
Moriarty is born into one of the main houses and is a maid [To give her an advantage due the paternally dominated society]