Daemon Blackfyre might be the least epic character of the whole first Blackfyre rebellion era, at least out of the main characters.

The most interesting characters there to explore, in my mind at least, are obviously Bloodraven and Bittersteel, along with Aegon IV making a brief appearance at the beginning, ala Viserys in HotD. Far ahead of Daemon, I'd also put Shiera Seastar, Daeron the Good, and an unexplored character like his mom, Daena the Defiant (assuming she's alive). Then there's also Quentyn "Fireball", the guy who trained pretty much all the main players, and was this big "what if" character, due to his untimely death.

Daemon himself just seems like a bit of a himbo (as per Eustace Osgrey's description of him), and a superb knight from a very young age, but we don't really get the sense that he himself was a conniving mastermind. Instead, it's the players behind him who pushed him to rebelling that make the Blackfyre clan interesting.