Wow, I am loving your passion right now. Marry me. Haha.
That's it, I'm telling Nate.
It's very rare that Nariko can AP burst off her neutral square. Also, it's hard for her to win a match. Her supers are just... The only good one is her level 3, and even then I don't normally get tons of kills with it. People in the air are hard to reach...
FYI, the 2nd tier of Neutral [ ] (yellow chains) will never connect if the opponent blocks or dodges at the gap between it and the 1st tier (blue dual blades). And like you said, it rarely starts an AP Burst in the first place because the 7th hit causes a heavy slam knockdown on people with normal hitboxes. It can only lead to an AP Burst if the 7th hit misses...this would be on characters like another Nariko, and the short characters like Toro or Sackboy.
I have gotten 9 kills in FFA Stock with her Level 3 before on Rival Arena and Dojo. On maps like Sandover Village, Paris, and especially Black Rock Stadium, I usually get at most 3 kills.