Sly's AP goes up faster than any other character it seems. I have been playing with PaRappa and Fat Princess most of the beta, and now today with Sly, and boy does his AP go up fast, and is Level 1 is super deadly it timed right. I mean you don't even need is other Levels. I played as Sly the last 3 or 4 times and won each time.
Any move if time right should be deadly
Ive seen every character get 3 kills with their level one.
Try jump attacks with parappa if you are looking to get alot of ap.
Sly can spam a skill and just over all seems to gain AP the fastest... his level 1 can crush all other players instantly, his level 2 will crush all players instantly and if you get his level 3 (rare because you only need his level 1 or 2 to get 3 kills each time) it can get 4+ kills...
That's almost exactly what they said about Radec and PaRappa not too long ago. Deal with it for more than a few hours and the Sly spam will be over. That's EXACTLY what happened on the first day with PaRappa and the second day with Radec. Each character gets a day to be considered OP.