Fav. Slytherin: Lucius, by a margin that's almost absurd in it's enormousness (it is a huge obsession fixation, I tell you) - not that I don't like Draco or Tom or... wait. Okay - Lucius. Yes, Lucius. Although nearly all Slytherins are just made of win.
Slyth/Slyth OTP: Lucius/Draco, and now, also Lucius/Albus-Severus (then Malfoycest of all shades and combinations, and Lucius/Regulus)
Slyth/non-Slyth OTP: Lucius/Harry, Lucius/Tom, Regulus/Sirius, Lucius/Sirius (Regulus is awesome, and needs more love <3)
House affiliation: Slytherin, by a big gap (dark, sarcastic to the tenth degree, ambitious, not a people person, proud, and quite scathing; not to mention somewhat full of myself, at times -g-), Ravenclaw next (love books, love writing, and I'm just plain vicious about my work being interrupted), Gryffindor after that (impulsive, brash, and sometimes just plain reckless), and Hufflepuff last (I'm loyal - but only to those I really care about, and I'm rather sarcastic and caustic about it on the surface, anyway).
-points above- It's her fault I'm here, by the way.