After the release of the Nurgle Battletome and Chaos Daemons Codices near the beginning of 2018, we were blessed with a plastic Great Unclean One, who's kit was accompanied by the creation of a new special character; Rotigus the Rainfather.
Also known as the Rainmaker and the Generous One, Rotigus is a Great Unclean One most attuned to the fecundity and generosity of Nurgle and, by extension, the natural world. As such, he's seen by many primitive peoples as a fertility God. But since he's still a Great Unclean One, there's an AIDS-y twist to it, eg, someone praying for more fertile livestock will find that this does happen, but the offspring produced will be malformed diseased monstrosities, or someone praying for food after a famine will be flooded with gross and brackish waters. He, like every Great Unclean One, is creepily happy about the jobs he does, actually humming while he infects loads of people with his diseased shitwater.