Hansel is one of the infamous Romanian twin assassins who appear in the anime series Black Lagoon. Alongside his twin sister Gretel, he is known for his childlike appearance that starkly contrasts with his violent and sadistic nature. Hansel plays the role of an antagonist in the 'Fujiyama Gangsta Paradise' arc, where he and his sister wreak havoc in Roanapur. Their tragic backstory and psychological complexity make Hansel a memorable and chilling character in the series.