I know boxing/swordfighting is a popular choice for Penelope's potential moveset, but... I want to go in a different direction with her.
Sly has his cane. Bentley has his wheelchair. Murray can clobber foes into next week with nothing more than his fists. Carmelita has her shock pistol.
We can't have two fist fighters on the team. Let's do something fun for our favorite mouse girl. She's a genius, right? Let's capitalize on that aspect...
What if Penelope dual-wielded a pair of morphing wrenches that can turn into, say, a giant hammer or a shield?
With the wrenches, she can quite easily defend herself and break stuff.
With the hammer, she could knock out guards. It'd be slow, but effective. And obviously noisy.
With the shield... well, that's obvious enough.
I even want her to inherit Bentley's old pickpocketing magnet.
If she ever does come back to the side of good, I want her classified as The Wild Card.
And if any enemies even think about looking at Bentley wrong... let's just say they'll have an extremely rabid mouse up their ass with an arsenal of weaponry at her command.
The possibilities are endless. Think about it.
Roxas... Oh, Roxas. The entire story got getting REALLY complicated the second he appeared. Not to mention the start of a sub-story of Sora-Clones as infamous and confusingly complicated as Spidermans “Clone Saga“. His inclusion can easily be seen as a gigantic mistake. I personally prefer Riku’s Replica, Replicu. His story was short, poignant, emotional and logical with a beautiful sad ending and his story was over after one game. I don’t wish for Roxas to die just that he or any other Sora Clones may not be inclduded in the games for at least the next fifty years.