Also, I noticed this while playing with someone else online, but if both players have Kokoro in versus mode, then she's playable on network. Though with no skills or spellcards, there's not much point unless you want a nearly impossible challenge.
I already won with her a lot of times against some friends, it's indeed very hard to win by popularity since she doesn't have any spellcards (but she can farm a lot of popularity with melee counters), but she has an enormous potential of chaining attacks and you can easily kill the opponent if he doesn't care enough.
And obviously, if both players take her, it totally balances the game.
I find very fun to play her in VS modes anyway.
By the way, some people seem unable to unlock her in VS mode, I wonder why...
By the way, tasofro takes too much time to finish their game, it's frustrating, they released their corrective patch less than 48 after the release of the game, and now they don't release anything else...