Kingdom Hearts Birth by Sleep Final Mix

Out of the three protagonists, she’s the least involved in the story, and she doesn’t have connection with Xehanort like the other two does. her visits to some worlds, like Dwarf woodlands & Neverland. It felt like filler, she doesn’t have her own exclusive rival like the other two, she doesn’t develop much as a character, her bosses are mostly Rehashed bosses that we already fought using Ven and Terra (fighting Terranort wouldn’t have changed the outcome, cause all it accomplished is her getting trapped in the Realm of Darkness while Terranort is back to Radiant Garden like nothing happens, since he  landed there the first time even if Aqua didn’t fight him).
Edit: on the bright side, her story in the Realm of Darkness is much better than all of her BBS story.
 

What cancelled Kingdom Hearts world would you like to see brought back?

What Kingdom Hearts game has the best set of Keyblade?

What features from previous Kingdom Hearts games would you like to see come back in future games?