The fetishes I have are fairly common, but depends on my mood, and are often ridiculously specific.
For example, take eyepatches. I really like them, but only on certain characters/situations. Twilight’s “future outfit” didn’t really do it for me, but I personally enjoy my headcanon that Derpy has a glass eye (and it sometimes falls out, causing her to try and hide her empty eye socket behind her mane!)
Another fetish is “damsel-in-distress”, where you tie a girl up and watch as she tries to escape. Bonus points if she tries to hop away. Putting her in actual distress (over a lava pit, next to a bomb, the classic train-tracks scenario) however, is a big NO! I don’t want to see her killed/injured, I just like her struggle.
Yet another fetish is (mild!) femdom, particularly if she’s wearing a skirt and thigh-high socks. I sometimes dream of a girl applying pressure to my face with her feet, especially if those feet smell slightly.
The first fetish I can remember having is young women missing a shoe, especially when they hop around on one foot. I don’t like high heels and pantyhose though, I much prefer sneakers/boots and socks.
I think I just like the general “distress/embarrassment”. It’s cute, it’s awkward, it’s just sexy.