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Often refered to as "Dukie" by his minions he was short-tempered, power hungry and extremely unpleasant towards almost everyone - he was even cruel to his own minions, ruling over them in the style of a tyrant or dictator: depending on his mood (which, as mentioned above, was almost always bad).
Prior to becoming the ruler of his own band of ogres Duke Sigmund Igthorn was one of the greatest knights in Dunwyn but plotted to overthrow the honorable King Gregor and was cast out as a result - forcing him to take refuge in Castle Drekmore, where he and his faithful Ogres remain to this day.
Duke Sigmund was the archenemy of the Gummi Bears and was the antagonist with the most encounters in the show, he is also the one who ultimately succeeded in destroying Gummi Glen in the later series, which marked a change in tone as his plans had up until that point largely met with failure (though, of course, he ultimately lost even this victory).
Finnaly, Duke Sigmund Igthorn check apparreance of cameo of the Darkwing Duck's Episode: In Like Blunt.
- As noted by the Nostalgia Critic, the duke looks and sounds similar to Skeletor. He is also similar to Gargamel, who wants the Gummi Bears for their Gummi Berry Juice to take over Dunwyn Castle.