Most interesting - Octavian, though he should burn in hell for all eternity for destroying the Republic, as should J.C. and the rest for bringing it about.

Favourite - I'm going to join Baba Ga'on with Lucullus; great general, instrumental in defeating Mithradates (though Pompey stole all the glory) who was betrayed by his men and his peers. Possibly also Cassius and/or Brutus - for trying to restore the Republic (though, IMHO, Brutus was an idiot).