The complexity of the daedric princes has always been one of my favorite things about Elder Scrolls, and something that isn't explored nearly as well as it could be through RP. Guilds limited to one Prince can be great, but will tend to be small. I want to gauge interest for an OOC community of daedra worshippers/followers/cultists, call it what you will.
The alliance of Mephala, Clavicus Vile and Nocturnal can make for some great RP, and we'll use ranks and notes to identify which Prince(s) people follow with the hopes of organizing daedric themed RP, rituals, summoning days, feuds between followers of rival princes, or whatever else the group gravitates to.
If there's interest in the concept I'll set up a Discord and from there see about getting something going in game,