
As an experiment, since I now have a functional and not too frustrating PC version of Oblivion, I decided to roll Ashana in that environment. Previously, she was just a character I'd created for a forum roleplay, that I enjoyed and hung onto.
So far as transferring her into the actual game, I had three specific details that needed to match. That she was a Dunmer or Dark Elf, that her class was "Agent", and that she was a Vampire.
The first aspect, I had a reasonable knowledge of; it's one thing I learned from being called scum repeatedly in Morrowind. For the third, I'd played a Vampire character on the Xbox 360 version of Oblivion, and thus also understood.
But the Agent class...well, that's what helped me the most with the character. My usual approach is to roll a custom stealth character with the skills of Security, Light Armor, Blade, and Sneak. This provides a decent level of combat prowess along with the stealth skills.
Agents lack both Light Armor and Blade as major skills. I realized just how fragile Ashana was right about when foes started killing her in two or three hits. Also, she can't carry very much weight, making a small dagger much more practical for a close range weapon.
Another major thing I observed from placing her in game is how the NPCs respond to her. With a solid Speechcraft skill, it's relatively easy for her to charm someone into giving her what information might be desired. Mercantile also keeps her in a decent supply of gold, though never quite enough for all the possible splurges.
But, the biggest thing from this experiment was being able to have a good visual of Ashana. While I'm still not sure about the hair color, I've managed to put the character together in a way I find pleasing. Though I will admit that Oblivion's fugly face generator can be troublesome.

Mods currently used:
Oscuro's Oblivion Overhaul
Ren's Beauty Pack (hair only)
New Face Textures
Improved Facial Textures
Kalikut's Better Glass Armor and Weapons
Fine Weapons 1.0
Unofficial Oblivion Patch/Unofficial Shivering Isles Patch