I love this concept! And I'd love it if Nintendo made a sequel to Super Princess Peach-it's an awesome game.(The only thing that disappointed me was when I found out the Koopalings were going to be bosses in that game but they took them out.)
I love the Fire and Tanooki Peach, even more than the official versions actually.
I'm loving the Mermaid and Angel Peach concept, they suit her very well. My only problem with this is that Angel Peach's wings look like they're hanging off her hair, but other than that this is awesome!
I like all of them, but I'd ditch the raccoon suit. Mostly because it's been done in Mario 3D World recently, and the dress and raccoon tail don't work for me.
Love the mermaid, but I have to agree with whoever said she'd probably get vetoed by Nintendo. I don't think they've ever had Peach so much as show off her mid-riff (correct me if I'm wrong). But on a concept level, I think it's great. I could maybe see a combo of Peach in a 1-piece swimsuit with the mermaid tail.
The angel wings and fire flower are both spot-on and I could absolutely see those making it into a game.
Actually, Peach's Striker oufits did bare her midriff (I prefer the original one, to be honest.), and her fire form became canon in 3D World, too (It's just her SMB1 dress colors and Sunshine ponytail, though.). I agree with the one-piece swimsuit-styled mermaid form, though.