How about Red Eco from Jak and Daxter? It doubles your attack damage, thus making enemies release twice as much AP than they usually do. And it only lasts like 10-15 seconds.
By the way, just call me Count for short.
I honestly don't really care about the items much at all. I'm going to for the most part play the game competitively and the items and hazards will for sure be turned off. I'm really hoping too that they have an option to join just 1v1 matches the correct competitive settings. I'm not against some casual FFAs for everything on, but I would prefer to be able to practice against randoms with settings similar to tournaments.
I do hope however there aren't any that give large amounts of AP just by picking them up. The ones that give a lot of AP should require there to be some sort of skill involved.