Well, that's League. If we were to stick to her Moba concept, she'd only have four abilities and a passive. Brawl isn't a place for limitations like that. Her Ult in League is her Up+B for Brawl as a recovery move, which on a 2D plane, it should be. Her Ult in League showcases her identity for mobiity whereas in Brawl, her mobility is incorporated into almost all of her moves simply because that's who she is in that aspect. I think it's a nice touch to make her ult a singular move in this move set. It leaves room for her Final to really bring her limit or most impressive attack we can imagine to the field. Keeping her Ult as her Final would be like Sonic doing multiple homing attacks on a person for his or Mario throwing multiple hammers across the field for his. I'm just saying we need something grand, something youd see in an epic final fight, something that would wow you.

I really cant wait for this! Play testing the PSA right now and it's job very well done so far. I await to see how the texture works with the moveset.

As for final smash ideas, maybe you could do something like meta knight's final. The initial attack after getting the smash ball would be a short distance charm heart. those who get caught by it are stunned and the screen goes black. Then ones stunned are clawed at for the damage.

OR

She could take a page from Luigi's final and dance seductively. She would stun them first like in the final smash above but then she dance for those in the vicinity, raising their percentage by a certain amount and healing her for a certain amount. I feel this really does pay homage to how Ahri actually is.

OR

She could throw a a much larger sized ball in front of her a ways but instead of hitting enemies away like the forward smash, the ball would trap the other players. The damage would depend on how long the player would be inside the ball until it reached Ahri again. When it returned, it would explode.

That's all I have for now and as I said, really looking forward to this! Good luck!