Rome
[09] Warrior
However, your timing can be the same for all tech ukemi JGs as long as you have perfect timing between the two G taps for the ukemi and the JG. Gotta know ukemi timings though.
Well, actually i'm ur opinion but i think from a certain hitbox size on u can't perform ( or at least as good as impossible ) and UJG. I think it has something to do with the extreme huge hitbox of Asta...
But apart of this point i'm ur opinion