As I begin to write my first draft (outline finished, so excited to finally start!) I ask this..........my MC doesn't have any special hobbies, and since my story is borderline romantic thriller and every event that happens unravels quickly, I don't really have time to think about what my MC likes to do for fun. I did give her a career, but other than that I don't go into much detail about her "fun" atmosphere. And the more I go into the story, I can say she likes peppermint hot tea, but just little details like that.
Do you really have to go into a full blown character desciptions by what they look like and do for fun??
You don't
have to do anything in writing. Well, you've got to be coherent, but then there are even novels that barely pass that and still get published (I'm not being ironic; I just read a book by Thomas Pynchon).
As a person that does not do well with outlines (oh I try, but they're so half-assed), I don't put so much into my construction of plot as I do with my characters.
...My inspiration comes from a central idea. I like music a lot, I'm driven by it. So my mc is really into music, too. As a girl into music, what would she do for fun? Well, go to shows of course, collect music, get a job involving music, hang out with people who like music, have a nerd-like knowledge of music trivia... Well, I've come up with a pretty good skeleton for a personality of this girl.
Since we have this simple skeleton, it can very easily be added to throughout the novel. You don't have to think of the details immediately, just drop them off where it feels right.
Also, what is her job, anyway? Why did she choose this job? Does it have to do with some hobby she loves? People choose jobs (for the most part, at least) that they have some interest in for a particular reason.