-Everyone gets a happy ending. Lea’s reunited with his friends (A freed/reformed Isa included, please. I just hope Lea and him can forgive each other, and rebuild their friendship. If Isa ends up dying, I expect them to forgive each other right as Isa fades.), they save the BBS trio, Sora,Kairi, and Riku get their peaceful ending as much as possible. All that sappy shit.
-Don’t pull something like ‘Oh, Xehanort has this failsafe magic trap to screw over whoever kills him on the off chance that occurs’ that sucks one of our protagonists into the Realm of Darkness or something like that. I have heard that this is just the last game in the Xehanort saga, but I swear I’ll die if we get some cliffhanger ending for the next game and have to wait another 5-16+ years for resolution.
-Organization XIII members that weren’t in 3D to show up. Either have them be members of the New O-XIII or perhaps have them take up residence in Twilight Town or maybe have them show up in a big damn heroes moment. (Like say Xigbar has Sora pinned and under fire, when all of a sudden we hear: ‘Dance water dance!’ followed by Xigbar getting comically soaked and shocked. Then maybe have Marluxia and Luxord both attack him.)
-Speaking of the Organization, I want Even to get a scene with Lea. Kinda see if he takes his pseudo-death at the hands of Axel as well as Ienzo did. (I kinda think it would be darkly funny to see Even sprinting down the hall in a panic while Lea’s in hot pursuit and trying to apologize for the earlier immolation.)
-Kairi and Lea training montage. Consisting of her chasing him around with her Keyblade looking like she’s about to clobber him over the head with it, and him running away while frantically trying to apologize for kidnapping her. (Since she seemed none too thrilled that he would also be joining in with Keyblade training.)
-Possibly see an attempt at betrayal from Braig/Xigbar? Maybe try to take Master Xehanort’s Keyblade or something. ReCoded’s secret ending had him get a sort of hungry look in his eye when Young Xehanort brought it up, and he also mentioned he had his own plans, but we don’t know what those plans are. (And tbh, he seems the type.)
As creepy as Vexen is, he did raise little, excitable Ienzo and he dedicated a lot of work to the Replica Program. Deep down, he might have a soft spot for mentoring those younger than him. This is, of course, supported by his superiority complex which he exemplifies a need to remind everyone of his rank of IV in the Organization. So. Yeah. Maybe he’s a creepy uncle type, maybe he’s the Organization babysitter.
Stop talking and start doing: My Fallout Shelter for my Tumblr blog 