The weird thing about BotW Zelda is that she doesn't fit with Smash Zelda's moves. I mean, yes, giving her the three Goddess powers isn't too much of a stretch, but I'm not sure BotW Zelda (I'm just going to refer to her as Champion Zelda, rolls off the tonuge better) would be using lightning kicks and blasting fire from her palms.
The thing is, I don't know how else to redesign Zelda to be Champion Zelda without completely redesigning her around BotW and the Sheikah Slate, or giving her different weapons like her rapier or the Bow of Twilight. But with the latter, she leans more towards Twilight Princess, and mirrors Link with his bow and sword.
With Link, it's easier for me. I've always wanted to see custom moves evolve into something more like the Miis / Palutena, but far more streamlined. With Link, you can keep his core Specials and still have the four Champion powers be alt. Specials:
- Neutral Special: Daruk's Protection. Typical counter move, except it reflects not only physical attacks, but projectiles as well.
- Side Special: Urbosa's Fury. Similar to Link's Spin Attack, Link charges his sword, and performs a horizontal spin attack while electricity stuns those around him in a small radius. As he moves forward, so does the electric field.
- Up Special: Revali's Gale. Charge it like Diddy's Rocketpack to gain vertical height. Ends with Link on his paraglider, slowing his descent and allowing him to move back / forth.
- Down Special: Mipha's Grace. Heals Link a small percentage of health, but has limited use and an extensive cooldown time. Don't expect to use this more than once a match.
... The more I look at this, the more I realize how I just turned Link into a Zelda semi-clone when I was worried about switching them around. Maybe Zelda could get the Champion powers instead? She is the leader, after all.