Mistaken identity - B leaning towards A! Identity porn is fun!
Epistolary (is this a trope?) - Speaking only for fanfic, I'd say C. I've seen it done well, but I'm not drawn to it on its own terms.
His Dark Materials fusion - Another B leaning towards A! I always love seeing what people come up with for daemons. There's actually a novel-length retelling of the entire CQL story only with daemons and I was very into it. The authors did a great job of making the daemons into vivid characters. By the end of reading it (it was so long!), I almost couldn't believe that the daemons weren't in the show!
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Epistolary (is this a trope?) - Speaking only for fanfic, I'd say C. I've seen it done well, but I'm not drawn to it on its own terms.
His Dark Materials fusion - Another B leaning towards A! I always love seeing what people come up with for daemons. There's actually a novel-length retelling of the entire CQL story only with daemons and I was very into it. The authors did a great job of making the daemons into vivid characters. By the end of reading it (it was so long!), I almost couldn't believe that the daemons weren't in the show!
Otoh, I don't see this very often.