Writing and developing original characters. Usually I have 0 motivation to write short stories for them, but I have endless inspiration that I jot down in my notes. I also like rewatching my favourite shows and movies (lately that has been The Office US and Breaking Bad).
Edit: maybe it doesn’t count as a hobby, but lately I’ve been finding myself trying to be more outward and daring. Carefully testing my limits socially and stuff like that. And I do feel good about how more straightforward and confident I’ve become.