IMPORTANT; I don't speakth the language, so this is all guesswork.
Did a K5 final performance, K6 1st day and B5 first day marathon and I have to say I did not know that she was a talker or maybe even the talker of the team. Everytime she comes up, her talks are never generic and when mentioned quick to retort. Then in K6 Umeda described her as the (team K?) dance master and so had no one to turn to during new lessons. Things didn't stop in new team B and it looks like she'll dominate (in MCs).
Who is this girl?