Your ult has a 1:1 AP ratio scaling. Your E has around 2: 3 AP ratio scaling. Your W has a 1: 3 AP ratio scaling for each part, so it's like 2: 3 AP ratio scaling. Your Q has around 2: 3 AP ratio scaling. You don't NEED AP to get your early game damage on.
I love it when Annie has 20 stacks of Mejais Soulstealer, with a Rabadons Deathcap, Void Staff, Rod of Ages and Sorcerers Shoes.
E -> R -> W = 80% Triple kill, 65% Quadra kill, 40% Penta kill.
^Though it's due to the guys magic resist and hp.
Damn, ~4600 dmg procast (+Q I mean.)