Princess Peach is a technical character from Ultra Smash Bros. IV and the princess of the Mushroom Kingdom of the Super Mario (series). She makes her fourth appearence since Super Smash Bros. Melee. She's already confirmed after Captain Toad's and Nabbit's trailer.
Samantha Kelly has the voice as Peach, not used from the Super Smash Bros. Brawl voiceclips, but she remastered the new ones.
Peach ranked the 12th place (A) on the tier list, which it makes an good character to play in the tournaments, thanks for her better double jump cancel and her air mobility for a projectile game with her turnips. It's an slightly improvement for Peach.