-shrug- He is also the guy who made TRS/Berwick saga, which is FE with better mechanics/gameplay. (I'm fairly sure he wanted to make it take place in the same universe, not Marth over and over. Like FE4/5, which take place long before Marths exploits, but on the same world)
DLC chars have map convos (talk command stuff). No supports, though.
One of the more interesting ones I thought was that Narshen, one of the villains from the Sword of Seals talks to Mariabel. Funny because Mariabel looks a lot like Clarine, a girl he was fond of so I want to see how that one turns out. It seems they've put a lot of thought into these things.
Also Celice is the son of the best lord ever. Which other lord can pretty much single handed beat all the enemies in his game? Well, his generation anyways. :P
Which ones? I'm just curious as to who, because none really pop to mind. The only real person who I think would kill a lot with the Hero Sword other than Sigurd would be Ayra, and even then she gets sort of screwed because she doesn't have a horse. First generation of course, I can't really remember much about the second generation right now.
Ayra doesn't need a horse. And Fin is amazing in the chapters you can use him after he gets the Hero Lance. Lex's usability in the later Gen 1 chapters also weighs heavily on whether he gets the Hero Axe or not.