In the speculative astrobiology book Teeming universe by Christian Cline, there's a planet called Hurcelion. It's described as a hybrid of rocky and gas giant planets. Most of the life floats or flies in the sky, while others shelter beneath constant storms above. Is this what a hycean world is supposed to be like? I ask because I need to rethink how I envision them then.
No. Hycean planets are hot ocean planets up to 2.6 times the size of Earth. While Hurcelion is twice the size of Earth (and seven times the mass), it is not covered in oceans. This post from the author's Instagram shows the surface of the planet is continental, about 30–40% land, and described as rocky and volcanic. The book also describes terrestrial life, but not oceanic as far as I'm aware.
Per Habitability and Biosignatures of Hycean Worlds, the paper that put the spotlight on life-bearing Hyceans, (page 5):
We note that in our definition of a Hycean planet there is no landmass as the entire planet would be covered by the water layer.
Further, the paper consistently speaks in terms of habitability of the ocean's surface, not the planet's.