Dullyanna
[10] Knight
Also, 623ABK, if the B is ever blocked, THEY CAN NOT GI OR STEP the K it seems like. I sat in practice mode trying to GI that shit forever, but it's so damn hard because you have to recover from BT first. Sophie AA seems to be able to interrupt the B though. Can step the B too, but since the 623 A is already safe and they risk stepping, they pretty much set themselves up for BT mixups.
That means anything i12 or under interrupts it (i.e. Sophitia, Yoshi, Amy, X, Taki). Fuck those characters to hell.
Also, the 6K series seems very nice. You can hold the second K for a tiny bit to hit check, and it'll still NC, I think.