I still consider myself as a beginner player (even though I've went to two offline tournaments so far). I'd ask ScattereDreams or Return of the Shadow for tips, since I haven't played DOA in months.
Where Kokoro lacks in moves that track, her stuns, for the most part, are satisfying once landed. She has a decent amount of unholdable stuns and an excellent damage output potential as well. It also helps that she also has a great pair of legs, but that's just me. Blackburry's another guy who's well-versed with Kokoro, based on what I've heard.