Will you be using a new character, or an existing one? Go ahead and post them here.

For Dawnguard:

Name: Maylissa
Level: 16
Class: Cleric
Gender: Female
Race: Imperial
Skills: 1H, Block, Light Armor, Restoration, Conjuration. Wields Dawnbreaker, Spellbreaker, and an Orcish Mace of Draining.

Haven't decided for the Vamp side, but I'll probably use my Altmer Mage, Arkved. He's a real scumbag and uses Destruction Magic.

http://www.gamesas.com/topic/1387731-dawnguard-vampire-hunter-build/

I'm using old ones and making a new one who will seduce Serana, marry her. Then kill her and take her property.

Name: Rhaegar
Level: 50
Class: Werewolf Warrior
Gender: Male
Race: Nord
Skills: 1H, Block, Light Armor, Alteration, Archery.
Gear: Ebony war axe, Shield of Solitude, Dragonscale Armor





Name: Luna
Level: 48
Class: Vampire Nightblade
Gender: Female
Race: Breton
Skills: 1H, destruction, restoration, light armor, illusion.
Gear: Glass armor, Chillrend, Diadem of the Savant

I use my one and only main character. Get to use the full range of my abilities, fight the toughest enemies.

My plan is to first use the new character I started yesterday (below) - he's an evil sort of guy who'll become a VL in Dawnguard - and once I'm done with that playthrough I'll bring back my main lvl 81 Khajiit to do the other side of the questline (ie. the "non-evil" pathway). A good way to experience both sides of the new questline at different levels.

Here's my new character:

Name: Vordano
Level: 5 (so far)
Gender: Male
Race: Nord
Skills: I'm still early enough into this char to go pretty much any direction as far as main skills go, but I've started going towards heavy magic use.

Name: Zaki
Gender: Male
Race: Dark Elf
Level: 81
Class: Assassin
Skills:All 100 but mainly uses Bows (soon to be crossbows) and likes too sneak with super crit.
Gear: Dragon bone weapons double enchanted and Improved to around 300%. Full dragon scale also imroved to armor cap.

The first thing I will do when I get on is Craft me some dragon bone arrows and A bow and 2 swords all with enchants and iproved to be super weapons. Lol

-Name: Aradal the Lightbringer
-Level: 81
-Class: Paladin
-Gender: Male
-Race: Breton
-Skills: One/Two Handed Longswords, Block, Heavyarmor, Smithing, Enchanting, Restoration, Alteration, Destruction, Alchemy, Speechcraft
-Gear: KOTN Crusader Armor/Weapons (Modded steel plate and weapons)

EDIT: Dawnguard obviously

-Name: Atlas
-Level: 63
-Class: Agent/Rogue
-Gender: Male
-Race: Nord
-Skills: One Handed, Sneak, Illusion, Destruction, Lockpicking, Light Armor.
-Gear: Guild Master Armor, Shrouded Hood, Dawnbreaker.

Name- Dyrwyn
Race- wood elf
Class- archer/assassin
Level 37
Uses bows daggers wears upgraded guildmaster armor
Probably gonna join up with the dawnguard itching to try out a crossbow