I've got a vague structure in my head but there's not a super coherent narrative arc. Every day, new dragon, and varying levels of factoids and anecdotes about said dragon. I trust myself to hold it together.
I've got a pretty low rate of drawing my own characters right now, partially because I'm still internalising and practising visual character design. I actually feel compelled to commission characters from established artists to get a base visual design, and then study/elaborate on that.