In regards to Hero, there's a strong case for him being a good competitive pick because a lot of his inconsistency issues brought up previously in the thread are circumvented by the fact that many of these inconsistent techniques consistently kill people at random or give so much advantage that they're worth rolling for. However, it's unlikely that most players will actually pick him up.
I'll give Sakurai credit for designing a sword-fighter in Smash Bros that does more than just "Swing your sword fast and barely in your opponents face" times infinity until the games over, but Hero's basic moves are slow. Most competitive players don't like slow, so he'll be pushed down a few places because of it. (Nevermind that the hitboxes of his moves are actually pretty good.) From what I've seen watching VODs, Hero is best suited for playing lame and stage control, using your giant sword swings to keep people out in between spells. Kaboom, Flame Slash, his thunder Side-Special, and Sizzle are extremely good moves that come about often and Oomph and Psyche Up are always worth the MP. Whack and Thwack seem to kill more often than not regardless of the percent (and I've seen it snipe people at some crazy low percents already) and Kamikazee is like the ultimate power-move.
The move that makes Hero borderline OP is Magic Burst. If this spell rolls up while you're at the ledge it's basically the game right there if Hero's MP is around 35. It's so ridiculously powerful it's almost like a cruel joke. A fully charged Side-Special (I'm just gonna call it Thunder Slash) eats up a good chunk of MP, but if used properly, it too can kill at fantastically stupid percents. Hero's so close to being unfair it hurts. What holds him back are fast characters who can just run in and beat him up. He's probably going to be gatekeeped from Top-Tiers at best but he has so much raw versatility that I can't imagine him being much worse than High-Tier.
As for the casuals playing the game, abuse the fuck out of Snooze. I guarantee more people will fall for it than not at that level.