Its called Final Fantasy Dissidia came out quite recently on psp.

Its kinda like KH in the sense of how u fight and running around doing cool attacks but its not an rpg tho it does have some rpg elements to it. But its a fighting game u engage in 1 on 1 fights for a better idea of the gameplay heres a vid. Unfortunatly this guy is **** at playing but u get the idea u get 2 do limit breaks/overdrive ect which is awsome. At the start u can only play as the gd guys but u can unlock the badguys and cool alternative costumes and u can eventually unlock 2 seceret characters Gabranth from FF12 and some other mage person im not sure on I think its one of the races u can pick from ff11 the MMORPG.

http://www.youtube.com/watch?v=Cu7bBFnYfzA&feature=channel