I wouldn't argue that Ike is that deep. Yes, he undergoes a pretty stark physical maturation between PoR and RD, but in his arc of going from rookie merc to mercenary company head to leader of an army and international hero to legend, he doesn't really ever seem to undergo that much dramatic growth in his character. In some ways, I'd argue he even regressed between Path of Radiance and Radiant Dawn.
Posts like this really just remind me how much I want a proper Genealogy of the Holy War remake on the level of Shadows of Valentia. Even as simple as the character arcs are, the narrative as a whole runs laps around the rest of the series for its ambition and how much it was able to pull off in its day.
Yes please. If only to finally put to an end all of the weird "isn't incest cute?" vibes the recent Fire Emblem games have been playing around with.