I started DOA5+ playing Helena and Christie as they are OP sexy. xD.
Then i tried Kokoro, and i liked the blend of a shy girl with the rage wolf game style.
Look at this , which best represents her rage temper
(credit to http://francisco2236.tumblr.com/)
I like her playstyle, that's the gamestyle i want to play. All in agressivity, no defense at all (or fewer than others).
Her Gameplay is strong, she has no kameha as a showoff, she wants to get the job done quickly. In short she executes.
Like Bushido said in is tutorial "Kokoro can be too sexy at times". Spent too much time looking her in her demon outfit watching this wiping little pearl of sweat, or in her rape swimsuit.
The rape swimsuit best represents a match with Kokoro. Losing the first rounds then coming back in the match with so much rage and winning at the end : A must see.
And last word : her Taunts. I love them. I used to use the "laught taunt" a lot. For me i considered it like when hitomi is saying " hey look i won, unbelievable". But now I never use it again since it can be considered very offensive ( happen to me in real match with an opponent i played against.) But i really like to chuckle like a brainless blond girl.
The "I"m sorry" taunt: The best use is when you are obviously losing the game against a master. you do it when you still have a slice of life : funny.
"It's not over yet taunt": obvious use is in her rape swimsuit