I qualify as bi, so I'm like half gay--or something. :UUU Peach is just... She's hilarious and she appeals to my love of magical girls and fashion. There's not a lot not to love. I think the only thing you need to enjoy Peach is good taste. ;P
I think it's both funny and ironic that some people stereotype Peach mains as being gay... since I play her for the exact opposite reason, lol.
I don't only play her in Smash 4, I've been playing her since Melee came out. She's not just my favorite Smash, Mario, or Nintendo character, she's my favorite video game character of all time. Not just that, I have both Amiibos of her, 3DS cover of her, a zip-up case of Peach for my 3DS, the Peach Wiimote and Wii U Fight Pad, the Super Princess Peach game, multiple Peach shirts, pink shoes to go along with the other Peach gear, a pillow, a plush Peach backpack that I have with me almost all of the time, and a lot more. Loving Peach, is one of the first things people learn about me, when they meet me.
I like Peach far more than Smash Bros! She was a beast in Super Mario RPG, one of my favorite games of all time. I love her sassy attitude in the Strikers games, as well as her overall spunky and slightly sarcastic personality in Smash. I love that she's always happy and optimistic, despite the fact that a lot of people hate Peach for some reason, and a lot of Smash 4 Peach mains are extremely pessimistic. Also love her in Mario Kart and Super Mario 3D World. Hell, I LOVE her in everything!
Tbh, Peach, and more specifically her booty, is the sole purpose and the only reason for the existence of my... Yeah... I'm just gonna stop there, lol.