It's not consistent in that regard. With Smash 64, there's only Samus and seemingly Jigglypuff, but that can be chalked up to it being the first one. Melee added Peach, Zelda, and technically Nana (who took the lead in some costumes, but wasn't the default character so I'm not sure about counting her), but Brawl only added Zero Suit Samus. (who was just another version of a character who was already in the game)
Later games did better in that regard (Smash 4 added Lucina, Palutena, Wii Fit Trainer, and Rosalina, along with some alternate costumes and the Miis; Smash Ultimate added Inkling, Isabelle, Daisy, and technically Dark Samus), though DLC leaned heavily towards men. (with Smash 4, it was just Bayonetta (and Corrin if you include alts, though the default costume continues to be male), and with Smash Ultimate, it was Min Min and Pyra/Mythra, not counting alts and Kazooie)
I'm sure it will do well when it comes to including more women, though; I remember that being a big complaint during the Brawl era, and they seem to have taken that into account for future games.