Askia, this prick is always in my games, he will conquer for about an era, and then get wiped out, or he will just DOW me from across the world, and then I have to listen about how he is sending a surprise army to my capital (which never comes).
Edit: Mongolia, not really because they are annoying but because they are always friendly with me, but are so worthless as allies I feel bad for them, like I saw them attacking with warriors in the modern era :/. and sometimes they'll attack city states right after they become my friend so everyone starts hating me :/.
And finally, Atilla or Asyrria, these guys always hate their neighbors and start the earliest wars possible, Atilla wanted to go to war with someone on turn 24, and im just all like, calm down bro I don't even have archers :/.