My mains have always been interchangeable, but I've decided to stick with Roy after I realized how well he can SHFFL. His aerials are both good and bad in my eyes. They're bad because they don't do adequate damage and are often awkward to sweetspot (like meteor-smashing with Roy's hair); however, they're good because they hardly have any knockback. This, when combined with his speed, can lead to one of my favorite combos: Dtilt to set them up, then a timed SHFFLed up-air crossup that can possibly cancel out my opponent's double jump (not sure if it actually can or if it's just the speed of the combo), letting them fall right into my forward smash from behind for the kill.
A lot of his other aerials don't send people very far, but I've tried using this to my advantage to chain them together, and I've found it to be somewhat effective, especially juggle-SHFFLing the up-air. He's an imperfect character in general, not just in attacks of course, but that's why I'm enjoying maining him.