I In my opinion have been mainly been using parappa since i got my hands on the beta and will be using him during launch and the only problem i have with him is his level 1 super I notice of characters can get multiple kills with their but for parappa it takes more timing and a right position to get those 2-3 kills now their is nothing wrong with his level 2 or 3 supers but I feel like some characters have a way faster advantage at racking kills with their level 1 super then parappa's.
I found the game amazing. It will be amazing with the 20 characters. The online is fluid even if this is a beta!
My most played characters are PaRappa and Fat Princess.
The first match I played PaRappa and won with 7 points =)
Then started to practice Fat Princess. Shes hard in the beggining but shes good when you learn (basically use the triangle a lot, and summon minions often)
My best match was with Fat princes with 12 points (well, i won 17 with Radec, but he doesnt really count. a bit op xD)
Overall, fantastic game. The wait will be worth it =)
PD: Feel free to add me if you want to play Smasher_Wolf