I wouldn't think it had to be a light fluffy fantasy, nor that it had to be a comedy. I would not expect high fantasy, but rather something quirkier and more grounded in things that happened after 1900. I might expect a kind of memoirish or didactic tone, but wouldn't mind being wrong. Or right! Memoirs and fictional didacticism (as opposed to authors' getting carried away with what they know and MUST TELL YOU) are delights.

P.