Worst character in the Mass Effect Universe

I'd have to give that one to the star kid.
I mean, Kai Leng is super annoying, sure but at least that character accomplished what it was supposed to accomplish. After Thessia and his troll mail, I really hated him more than probably any other ficitional character and despite the fact that I am usually a very calm person and a pacifist, I wanted this guy dead. Sure, BW did it by making him super annoying, giving him plot armor squared and taking control away from the player, which are all cheap tricks and bad game design but still, I have to admit that it worked.
Also, his death scene is really satisfying "This is for Thane you son fo a bitch!" was pretty glorious, I have to say.

Oh, and also, before the game goofed the crap out of him, Kai Leng was actually a pretty awesome antagonist for Anderson in the Retribution novel. I really liked him there as a character.

So while Kai Leng is far up in this competition, he has some redeeming qualities at least.

The star kid on the other hand does not. The kid was already annoying in the prologue and the dreams but it's role in the ending disaster put him squarely on top of my ME shitlist. The star kid makes no sense as a character. It simply is the worst and the only reason why it might not be on top is because one could make the argument that it isn't even a character at all but just a lame plot device. But since it talks and interacts with Shepard to some degree, I'm putting it here as the worst character ever!