Only factions I really hunt down are Stormcloaks and thalmor, Stormcloaks are idiots and Thalmor are [censored]s.

Oh.. I kill a lot of goats too with the voice...

Bandits, I mean.. Half the time I get "Halt.. You have to pay a toll".. and then they attack anyway.. so turnabout is fair play.

Vampires, Hmm.. immortality at the cost of having to feed and be hunted by people like the Dawnguard, Sure some Vampires are ok.. Serana and her mother Valerica aren't too bad. But as a general rule I kill them all, especially the... "Hey you! Uh.. Traveler, Come here for a moment!"... They usually don't live beyond that...Sadly, they should pick their victims better.. A Dark Brotherhood Assasin.. especially me... Not a winning situation.

Skooma Dealers, I admit, I'm not a very nice assasin.. I usually kill them on sight.. unless its an Argonian, I do not typically kill my kinsman unless they're bandits.

Thieves, The smart ones live... Any foolish to say "Don't you walk away from me!" and attack.. Die.. I'll apologize to the Thieves Guild later.

Most other things vary on the situation.. Typically I don't like killing dragons, as thats what the "Blades" want, the death of the dragons.. Sorry.. But I side with the dragons, so only those foolish enough to actually swoop down and attack me fall.

I always attack the Thalmor, regardless of what kind of chcaracter Im playing as. Also the Vigillents of Stendar, but only if Im a Daedra worshipper. Usually the roaming orc that calls me a milk drinker too.

Thalmor, bandits and everything that's trying to be "funny" (guards, nazeems, you-know-who's ).