Ibon Feralrite, probably. Human adventurer who I played as a year or two ago.
I started off by just sneaking into bandit camps and slitting the throats of the sleeping ones, then fighting the ones that saw me. All pretty normal, then I became a vampire and decided to go full evil.
Went straight to a necromancer tower and learned how to raise the dead. Then I went to a bandit camp to get my first few zombies. After that I went to about 2 villages, killed everyone with the bandit zombies and raised as many as I could see. Then I made my way to a city, killed everyone in the keep and took the town over.
I got pretty bored after a couple days so I went into the dungeon of the city I'd taken. Unfortunately, one of the bandits in there got a lucky shot on me and smashed my leg apart.
So now I had a slow adventurer with a zombie army, and the zombies were getting all the kills so I was even more bored. I attacked my zombie companions so they would abandon me and set off into the wilderness.
I was just about to stop resting so I could retire him, then I was attacked by a small group of about 2 people I saw coming on the travel screen. I had no idea why they were going through there, because it was pretty out of the way of any roads and towns, but I killed them. I waited for a couple hours again, and then I saw another * on the travel screen coming right towards me. This guy put up much more of a fight, he was able to parry and deflect a lot of my strikes and managed to mangle my ears and knock out a couple teeth, but I killed him too.
These small groups came and attacked me about 10 more times and by then I thought the game must be fucking with me. So I thought that maybe it was on purpose, and the civilization I took the city from was really mad at me and were just sending their soldiers into the wild to find me.
I went to a village, killed and raised the populace, and went to the capital of the civ.
I go to the most populated part of the city, the market, and let my zombies loose. Only a couple follow me away from the market as the rest are preoccupied with the merchants, and I made my way to the keep. There were a lot of guards in this city, more than I usually see, and they held us back at the gates of the keep for a bit. I slipped through and ran into the main hall covered in blood. I charged at the law giver and expected to kill her quickly, but she managed to fight back for a minute or two.
After a while I cut off her head and threw it outside of the keep. I killed the rest of the people in the hall, taking a few scratches but nothing that would stop me from fighting.
That night I walked around the streets, going door to door and killing the odd citizen when I found the War Leader deep in a cluster of homes. Pretty satisfying to kill him, because I thought the zombies had killed him when they entered the hall, and I got to have a one on one sword fight with someone who would take more than a few minutes for me to kill.
After that I went to the keep and retired Ibon for good. There weren't any beasts around and bandits weren't much of a challenge so it was best to end it there.
I probably have a couple more adventurers who are much more badass, but this is the one I remember off the top of my head. Have a folder full of notepad files from adventurers so I'll have to look through them