These days I'm a little cautious about featuring poster-villains in plots they initiate. I think that should really be the domain of their creator. In Untold Tales they pretty much always have to get beaten anyhow and that feels like I'm belittling the character. At the very least it requires a lot of co-ordination and "permissions" that I don't always want to spend the time and energy to gather.
That's no relection any any of the current or past posters who have had villain avatars; it's rather an admission that I don't have as much time and energy to invest in this as I once did.