it's tough to find a favourite. i was fond of crap sharks (or pathetic sharks) from viz in the 80s, they were scared of people, water, fish, everything and spent their whole time chatting about inconsequential stuff, weather, clothes, and whenever something'd happen or they were called upon to act, they'd fall into hysterics or run away
no, I do like the real things. no particular favourite but I'm keen on the outrageous facts marine biologists turn up. that some sharks can't stop moving else they stop breathing. and I somehow used to think that they didn't stop living until they were killed by another predator, like perpetual motion submarines. bollox of course, but it sounds good. can't remember where i got the idea from, but it always stuck with me. perhaps it's cause they're are so out of place in our world. Sharks haven't changed their design for millions years, evolving before the dinosaurs had made an appearance, a living document of the world 300 million years ago.