I'll go with orochimaru because his description correspond to the perfect villain material
He's creepy, doesn't care for anyone(well maybe?), powerfull(for god sakes, that guy got killed, sealed by itachi into a genjutsu that your are not supposed to come back and yet he still got revived).
If I would choose a second one, probably pein(although he is not evil anymore), I always love that character because he actually managed to destroy konoha in like a few seconds. Also for his personnality, his cold blood.
Madara is cool and badass but WAY to overpowered IMO.