Not exactly who or how this character plays. But there'd be a massive delay on recovery to make up for the massive hitbox advantage.
The first hit box frame would last 1 tic. The end hit box would be determined in game and edited down to probably 2 tics, maaaaybe 3.
I should have extending his blue boxes to match where his arm first travels in the 1 tic attack frame, but that'd be worked out after a few tests.
Spoiler: LARGE GIF INSIDE (click to see content)
Yamori X, why would you be able to hit all that open blue above the ax?