Now it would seem to me that Ike is a semi-semi-confirmed character. As I recall, Nintendo Power said that the level is Daein Castle from Path of Radiance. I seem to remember that they themselves were speculating about whether or not it is for sure, but perhaps not, so correct me if I'm wrong. That right there semi-confirms a PoR character, and the fact that Ike is the title character seems, to me, to make him very fair game ("semi-semi-confirmed), as well as his primary party mates like Lyn, Titania, Volke or maybe Mordecai or another Laguz for their transformative abilities.
The fact that Daein Castle is there seems to me to merit tacking him onto the list under Yoshi in the semi-confirmed section--I doubt they would put anybody else in first besides the title character if they're using PoR.
However, I'm not that versed in Japanese Fire Emblem besides from what I've read of story summaries. Has Daein Castle ever appeared in another game?
The fact that Daein Castle is there seems to me to merit tacking him onto the list under Yoshi in the semi-confirmed section--I doubt they would put anybody else in first besides the title character if they're using PoR.
However, I'm not that versed in Japanese Fire Emblem besides from what I've read of story summaries. Has Daein Castle ever appeared in another game?