Micaiah can't be in another game - they said she was queen and kept Daein pretty much out of war for the rest of her life.
Ike could have a quest over at where Nailah and such are from. One thing that makes me think this is possible, is what is said about Soren in the epilogue (is that the name?)
It says something like this:
Even though Soren was a master tactician, he never used his abilites for other than Ike
This could just mean that he never used them again, but it seems like it is sort of hinting at a sequel.
A problem with that would be that Ike is way too good, he would just smash all the guys over there. So it would have to be 1. Some magic potion or something nerfs him back to Mercenary lv 1, same happens to Soren or 2. Ike enters at the end of the game, while we fight with someone else over there first.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS
