2. Morrigan - Astral Vision
You know that part of a scary movie, when the protagonists finally kill the bad guy and everyone breathes a sigh of relief, only to find out he's actually not dead? Now imagine this movie for an entire match and you'll see why Morrigan has been feared by beginners and pros alike. Astral Vision is a hyper which creates a reflection of Morrigan on the opposite site of the screen. Whatever Morrigan does, it does, including shooting as many projectiles she can possibly muster. This in turn causes "bullet hell" as the whole screen is quickly surrounded by soul fists from all angles. Then, when the bad guy finally goes away, Morrigan just summons another one and it's back to the start of the movie. Not only does "bullet hell" suck, but just the sight of Astral Vision makes a player frantically search for some sort of cover even if Morrigan just decides to fly around. Great stuff.