I am not interested in Princess Peach's Showtime, which is option 6. It basically boils down to being indifferent about the character, which is something I felt about Luigi (which is why I am similarly indifferent to Luigi's Mansion games too). The central draw of the game is sound, where Peach dons various costumes to gain some new abilities suited for the play in hand, so I imagine if I were more fond of Peach, this would be interesting. As it stands, it's not a dealmaker for me.
Even then, I hope this game will be successful because it does things that is more positive to the character. Two things that stood out is how she is given a chance to help herself out of a predicament instead of relying on a hero to rescue her, and how the crisis is not predicated on Mario's kidnapping to augment the main character's importance (an issue which I felt is central to Luigi's Mansion, where I felt like Luigi's independence in heroism had to be tethered to rescuing Mario, instead of him tackling a threat without Mario's involvement). Basically for the latter point, I am all for the characters getting their games, but it shouldn't be at the expense of Mario, something Donkey Kong Country thankfully averted.
Thank you for reading.