Not sure if this is a guaranteed kill, but it's worked for me everytime. Seems like there isn't enough recover time to avoid the super.
Simply hit an oppenent with Standing O, then Level 1 super with Parappa. Done
very simple one for Fat Princess similar to the one previously mentioned just shorter and can catch multiple players easily
Sqaure, Sqaure, Up Triangle ..Good AP.
DS, FT (Easier to land then DS, US, S, but only nets 40 AP)
O, (counter hit), S, S, US, S (this one is amazing and nets like 55 AP)
(Up Throw), UT (really good keep away, and punishes them by taking away their meter, nets 30 AP)
I have a few ideas to maximize AP gain using sly, parappa, and radec... but I haven't tried them yet