Tculo is the third disease-demon child of good Queen Ana and the wicked King of the Loçolico, born after the latter had grown jealous of how many grody grandchildren his first two offspring sired together (eww). Tculo specialized in abdominal ailments, which he spread by rolling around in his victim's intestines. While nobody was safe from the prickly pestilent parasite, Tculo took particularly pleasure in provoking pregnant people, including his perpetually parturient sister Lilyi...
When little brother Tculo refused to get out of big sister's insides, Lilyi demanded her other brother and husband Melalo find some way of extracting their stubborn sibling, and unfortunately for everyone Melalo decided the best way to do that was to convince their father, the King of the Loçolico, to force himself upon his wife, Queen Ana, until they produced a sister-wife Tculo could call his own. Thus was born their fourth dreadful child: Tcaridyi.
Like her consort, Tcaridyi spread diseases by crawling inside her victims (primarily pregnant women), though the worm opted to traverse veins and vessels, shedding hair as she went which caused fevers, inflammation, and all manner of bloodborne blights. Tcaridyi and Tculo had many, many horrible children together, all of whom shared their parents' (and Uncle Melalo's) misogynistic streak.