One that is not characters but worthy of a mention: Those corpses you deal with in redcliffe. They are bloody fast. And the game is not designed well to deal with them because you can't even really hit them but if you target them and do a strike with a sword, it hits them even if they are far away. How are corpses so freaking fast? How?! Watch The Walking Dead, people. Corpses DO NOT RUN. They shuffle. This has history. Zombies, corpses are slow. Even the deathlords in skyrim were not THAT fast. Though they could shout you butt across a room or off a roof.
For characters with no good reason?
Wynne but is her preachy BS that I find so annoying a good reason? I mean, I really want to tell her to suck it. She's like one of those brainwashed fools that just repeats what she's told - this comes up so very nicely at the gauntlet.
Sten - his tone bugs. Really, it just does. I leave him in lothering.
Dog - annoying barking at camp bugs. Really it does. I don't get the dog anymore and then I went and did ostagar and it was there. Dragged me into a cut scene when I was getting the damn key and suddenly I now owned a dog that I actively went out of my way to not get. And then at the gate it's one of my controllable parties. Wynne suddenly is not an option. Sten, oghren and either Zev or Leliana and the dog. Well, I wanted to run the mage dammit. Two handed warriors don't need me to control them. Neither does the damn dog. So no more ostagar return because I'll end up with that damn dog and I don't know how to get rid of it. But now that I don't get sten anymore it's not an issue if I were to get stuck with the dog. At least a mod shuts him up. There definitely can be TOO MUCH realism. That yapping dog in my camp is proof. Someone kill it already.