358/2 Days Unlocking Mickey & Sora

So, do you need to unlock all the secret missions and complete them 100% to unlock them? Even if not, how do I unlock them in later days? Do I have to start a new game file to be able to do so?

 

Clear All missions for Mickey item to appear on Mog's shop, and all completely (No need for chest though) for Sora's item.

All the missions members unlocked after you did something specific are unlocked after you beat the game, so you just need to go to the mission menu to do them.

 

You need to do exactly as you said. To get Mickey you need to unlock all the missions(even the secret ones) and clear them. To unlock Sora you need to unlock all the missions (again including the secret ones) and clear them 100%. Oh and there is no way to this in later days( If by that you mean after you beat the game), if you didn't do what I stated before you are going to need to start a new game file, sorry.
Here is a guide that can help:
http://www.gamefaqs.com/portable/ds/file/943346/57522

 

That's weird, because recently I saw a completely new mission pop up in an earlier day. I would have remembered seeing it before.. So maybe it just doesn't tell you?


By later days, I mean like, if one was offered on Day 154, and then I'd try to get it on Day 301.

 

Oh no, you can't do that. You unlock the secret missions by talking to the Organization members in the Grey Area and completing certain tasks for them. And if you don't them when they are offered, they won't be offered again on later days. The same goes for regular missions.

 

^ Ummm No.
At the endgame (Game Beaten) all missions are unlocked even the ones you were supposed to get from Org 13 partners
Unlocking Sora Means defeating Dustflyer Good luck on that :why?:

Hope this helped ^^