Laugar

Quite outgoing, and also very smelly and unhygienic. It simply isn't something that concerns her. She's an absolute gremlin and owns it.

Also, the Lord of the castle she lived in actually erased all of her memories while she was becoming a vampire, including her first language and name, so she barely had a sense of self at all for a while. Neither did her brother and the others who were stuck in the castle as vampire minions. They weren't supposed to leave, the world was dangerous outside. They needed the Lord, he provided them food and shelter, he was a good guy! After all, the Lord knows best. 

Then that new viking boy showed up. He had somehow beheaded the Lord in a fight, but also suffered a major injury himself. They were both knocked out of commission for some days. During this time, some of his fellow vikings showed up to get him home. However, this gremlin girl and her fellow minions were getting really thirsty, and the Lord wasn't around to provide food!

So... they killed and ate these vikings who barged in. This, of course, resulted in a punishment from the Lord when he finally woke up, as they didn't leave anything left for him. But the viking boy had woken up too, as a vampire now. And amazingly, he was still completely intact. He still knew his language, he still knew his name.... maybe he could give her a name too. These were thoughts that were running through her mind as she was stuck in the dungeon, and when she first went and said hi to this new resident, he had something to say as well.

"Laugar þú verðar, nú." 

Laugar... She likes it!
She has no idea what he actually said, but she figured it was probably something along the lines of "Laugar is your name now. " (spoilers: it really wasn't, but honestly she doesn't care, she just desperately wanted a name again)

Over the next decade, the viking kid, who seemed to call himself Einarr, would help her little gang of former minions realize the Lord is a gaslighting liar, and finally overthrow him and get out of the castle. (The other two were her brother Hvasshár, and Kvikindi, a small kid who was most likely older than all of them)

Anyway!! 

She's free now. And she didn't really bother joining society. 

Instead, she went into the woods. She loves the woods. Especially the darkest, deepest parts of it. The sun barely ever shows through the trees here, and even if it did, it isn't a huge deal, as it turns out vampires don't actually combust into flames at the smallest exposure of sunlight. She's fine. The animals here are delicious, and she is good friends with the local werewolves. Nature is great, actually!
She loves being the local forest goblin that parents would tell scary stories about to keep their kids from going too far into the forest. It's the best. 

Her specific vampire abilities include poison spit, intuitive counting by a simple glance ("mmm, there are 491,523 leaves on that tree." "what, how do you know" "idk, just a feeling"), strong intuitive sense of where living creatures are, and being easily able to find her brother somehow. Okay, maybe the latter is just a strong sibling bond thing. Obviously she can also turn into a bat, but all vampires can do that.

Also, maybe she did try to live in society for like two days back in the 1600s just to see what the heck Hvass kept going on about, but she quickly decided that this was not for her at all. Still managed to bite one human, though. She later died in a fire and became a vampire too, but Laugar didn't know that for a very long time.

And no, she still hasn't taken a bath in at least a thousand years. She just really hates water. 

Her name is very ironic.