Note: Just a small list I'm forming up as ideas and suggestions on what one could do to further flesh out a character and their personality.
I've thought it would be interesting to form up a list of small things, details that can add a character more depth or be a surprising twist to a character. For instance a wolven having a sweet tooth. They can be mildly comedic contrasts or further reinforce what kind of character they are. Filling out this list is by no means required but certain could be potentially fun and useful for you for getting a 'feel' for a character or if someone asks them for their favourite food you can order it up.
Music:
Music is the thing that made me think of making this sort of list. If your character lived in the modern world, what sort of music would they enjoy? Are they a sophisticated classical music lover? A rocker or a metalhead? An example would be my Naomh, whenever I think about her for music I see her being a bluegrass and country gal, especially the old school twangy kind but having fun with the more modern forms,, 'Cottoneye Joe' by Rednex would be a perfect example of a silly light-hearted thing I could totally see my foxkitten square dancing to. ((hee))
Food:
This is a far more common one, less a personality secret and more something that can impact things ICly, what sort of foods do they like? Guilty pleasures they can NOT resist? Foods they just can not stand and maybe even foods that do not agree with them, either general discomfort or full blown allergy? Using Naomh again she's a bit of a carnivore but in general enjoys eating rich, hearty foods especially stuff commonly found on a farm dining table but has absolutely no taste for sweets, cakes, many pies, chocolates and candies.
Related: Drink. Tea? Flavoured or straight? Coffee? Alcoholic drinks? What kind? I've known people who drank nothing but coffee whenever they have the choice then there's other who only drink water.
Colour:
A small simple one, colour. What is their favourite? -DO- they have a favourite? Do they have a bias for bright colours or dark? Warm or cool? Pastels or natural? Do they enjoy things to be simple and few colours or do they like a rainbow of colours? Roughly related: How do they see colours? Some people can see colours better than others, and some are outright blind to a kind of colour, or even all colours!
I may be adding more to this list in the future but here's some stuff for now, hope it helps you make out some fun facts for your characters and can get a better feel for them. Again you don't have to have all these answered (I certainly do not) but it can be amusing and interesting what you come up with!