|Jafar says: Read my lips and come to grips with the reality!|
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The Swamp Demon is a minor antagonist in Demon Slayer: Kimetsu no Yaiba Manga and Anime. He is however, the main antagonist of the First Mission arc. He was a demon who went through a rash of kidnappings during the first mission of Tanjiro Kamado for the Demon Slayer Corps.
He is voiced by Ryohei Kimura in Japanese and Sean Chiplock in English.
The Swamp Demon met Muzan Kibutsuji when he was a human, who gave him a sound beat and turned him into a demon. Muzan warned him never to reveal anything to anyone about Muzan, and that he knew would immediately if he ever did. Due to this, has left forever afraid of Muzan.
He also separated some elements of his personality by splitting them into three, to the extent where each acted differently from the other.
The Primary Demon was calm, analytical and serene, gave others guidance and even recommended calm down to his Secondary Body, which is why he was seen as the leader of the Trio of Demons. He was someone with rational thoughts and evidence of this is seen when he challenged the relationship of Tanjiro and Nezuko, which he sees as odd because of the actions of Demons with Humans, and he is also someone who celebrated the victories prematurely by telling Tanjiro that it was a fool to willingly join his swamp. Rarely has he lost his composure.
The Swamp Demon had three bodies, with the first body having one horn, the second having two, and the third three. The Swamp Demon has pale skin and long blue hair with red eyes, and all bodies wear black shinobi clothing. The first body wears a long uniform with mesh on his carpus and neck, with numerous pockets on his uniform as well. The second body has a uniform without sleeves and mesh on his chest. The third body's uniform had mesh almost on all sides of his arms and shoulders. Under his clothes, he wore a blue bottleneck shirt without sleeves.