In my opinion, one of the biggest traits of a Sue is the way that the plot and setting bends backwards for him/her. The plot will warp around them, with nearly everything focusing on that one Sue. Everything has to do with Sue, with the Sue being the center of nearly every plotline and recieving excessive screentime for Sue's cast position. Finally, this kind of character tends to get shoved down your throat; other characters will often compliment Sue constantly with how cool, pretty, etc he/she is.