It's hard to say exactly as this is such a specific type of fanfic. But one possible unique feature could be that the author might use Pinkie Pie's feet as a symbol of her stability in all her zany adventures. For example, her feet are always there to keep her from floating away in a world full of magic and chaos. This could be a really interesting and unique way to look at her character through the lens of a fanfic focused on her feet.
I haven't really come across many 'MLP Pinkie Pie feet fanfics', but if there are, perhaps they might describe Pinkie Pie's energetic movements in relation to her feet. Like how she bounces around and her feet play a part in that bounciness.
In general, fanfics can be very creative. So in the case of 'MLP Pinkie Pie feet fanfics', they could potentially have unique features like using her feet as a way to show her connection to the ground, almost like she's grounding herself to Equestria. Maybe the writer could describe how her hooves touch different terrains in a really detailed way, adding to the overall atmosphere of the story.
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