Here's a question I'd be curious to hear y'all's opinion on: do you think Isaac's sword should be held with one hand, or two? In other words, do you think Isaac should wield a standard sword like Link, Hero, and most of the FE cast, or something more along the lines of what Ike and Ganondorf have?
Edit: Personally, I think he should use a two-handed sword, both to separate him from the majority of other sword users in the game, and because I'm fairly certain that both the Gaia Blade and Sol Blade were two-handed swords and it would make sense for Isaac to be wielding one of them.