Random thing I thought of based on an episode of The New Adventures of Winnie the Pooh:
A lot of people headcanon Rabbit as having OCD because of his obsession with cleanliness and otherwise having things in order, and that does make a bit of sense and that's just ONE way it can manifest.
But, I have another idea.
I'm not throwing out that old bit of fanon because it can still fit. But I remember in the episode where he, Pooh, and Tigger were preparing for a party for small rabbits, Rabbit had a list of things to do that included very small things like brushing teeth and combing ears alongside sublists for Pooh and the rest with more specific things that need to be done to prepare for the party, since prepping for it was on the first list we see in the episode.
That got me thinking, does he have issues with organizing and starting tasks? Does he have issues with procrastination? Because that's something I can kinda relate to and I have thought about making similar lists of small tasks that I need to do because I've fallen out of various good habits I formed in childhood for the past few years. (Do I ever get around to making such lists tho? FUCK no!) Plus he's pretty much always on the move and may even think better while pacing or just moving about in general.
So, here's my thought. In addition to OCD, he's also ADHD, possibly the hyperactive variety. I'll have to look back at the series and the movies though so I can get a more detailed look at his habits and such though, but that's the basic headcanon I've been thinking about lately.