Bubonicus

Bubonicus also known as Lothar Bubonicus or by his deamon name Ghur'urgh bu'yue is a Daemon Prince of Nurgle from Warhammer Fantasy and Warhammer 40K introduced in Realms of Chaos specifically The Lost and the Damned
Warhammer Fantasy
His story starts in an unnamed village that was being ravaged by a plague known as the Green Death, scared of dying in such a way he prayed to Nurgle to save him (so maybe he was in some Norscan or Northmen villiage?). He ended up being the sole survivor which he took as Nurgle's favor, though whether or not he was infact blessed or simply survived due to being the hardiest in the village is unsure. Either way he trekked into the woods on his way to venerate his new chosen god. He quickly gained a retinue of Beastmen who recognized him as blessed and then rescued him from Witchhunters, a handful of Chaos Dwarfs, a knight from a company who tried to kill Lothar and his peeps but miraculously survived his wounds and was taken on as his personal henchmen named Grod. They would then assault a group of monks carrying holy artifacts, and Lothar would acquire a golden palanquin that immediately tarnished at his touch and he took as his personal ride. He was then led to the town of Uberaverglau by Skaven where he infected the prince and nobles with disease and his followers swelled with the peasants of town, witches in hiding in the area, and the aforementioned Skaven who also were the ones who granted Lothar the name Bubonicus. Receiving a vision of Nurgle's garden he decided it was time to stop screwing around he lead his followers to the Chaos Wastes. Following daemonic runes left by snail trails he came across a chaos steed which he awarded to Grod who now had a super rad Chaos Big Arm which he used to protect his master. At this point Bubonicus and his war-band clashed with a Champion of Tzeentch believing it was a test from Nurgle after 20 years of wandering. After crushing their foes Bubonicus gained yet more followers in the form of an Ogre and a Chaos Witch. Just as he was about to cross the threshold into the Realm of Chaos he was cockblocked by another warband, feeling like this was the last challenge he and his homies threw themselves at their would be challengers. Bubonicus's fervor in battle and utter devotion was finally caught the eye of his god, who then granted him Prince-ness. Grod survived the battle and took control of what remained of Bubonicus' retinue and honored his master by having them carve a monolith inscribing Lothar's tale to stand in the Chaos Wastes and tell the story to all who pass by.
Warhammer 40K

His history in 40K is markedly less detailed unfortunately. all that's known of his origins is that he was born on a backwards planet engulfed in warpstorms, coincidentally the same planet that the 40K version of N'Kari and Werner Flamefist. He was eventually Raised into a Daemon Prince, along with the other two (must have been a hell of a planet) and served his Chaos God faithfully. He was later summoned by Erebus during the Horus Heresy alongside N'kari to fuck shit up and thats pretty much all we know about him vis a vis 40K.
Gallery
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Bubonicus' mini, looking constipated as hell. Just like Nurgle would want.
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Another model of The Boy. Since hes not really listed with any weapons the glaive here is just as valid as the sword and whip.
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His Battle Standard, helpfully held by Chaos Dwarf lookinga little green around the gills
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The Posse. You can see Grod up there in the upper right.