If we got Edelgard, I'd hope that we'd get Claude and Dmitri as alternate costumes.
Or, maybe, to illustrate the different weapon types and the customizable nature of the students in Three Houses, we'd get a three-person character like Pokemon Trainer. With each House Head jumping in with a different weapon changing with down B. Like Edelgard uses an axe (As she's shown using in the Direct's trailer), Claude jumps in with a Lance, and Dmitri uses something else that isn't a sword (There's a ton of options here, and the sky's the limit!). That's honestly a pie in the sky hope but I'm thinking that if Sakurai is going to put a Three Houses rep in as one of the premium DLC characters, he'll have to really make it worth it or else the community will be irritated. We have a ton of options. Heck, maybe all three can be different kinds of riding. Edelgard on a Pegasus, Claude on horseback, and Dmitri on Wyvern, all with different pro's and cons.
Plus we need more "transforming" characters. They're the best