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Specifically, he is implied to be the Joker, as he was the court jester. Jevil, like other Dark World denizens, is implied to be a playing card. Seam however finds some sense in the words of Jevil, indicating that his insanity might be a form of awareness.
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Now insane, Jevil is still portrayed as an eccentric individual, prone to maniacal laughter, rambling puns and strange sentences and having a sadistic sense of entertainment, considering battle with the party to be a "game." He has a very cynical view of the world around him and considers everyone around him to be trapped while he is the only one truly free, despite ironically being jailed from the world. Prior to losing his mind he was a jester with a presumed jokey attitude and a friend of Seam. Jevil is described as mad since he met a "strange someone". His head appears to be connected to his body via a coil spring (akin to that found in a jack-in-the-box), which is only exposed when attacked. He wears a purple and black harlequin jester hat with two small yellow bells. He is dressed in a purple shirt, black trousers, a black cape, green slippers, black socks, purple mittens, and a lime green and yellow jester's collar. He has a purple tail shaped like a capital letter J. He has a long, purple tongue which can be seen either when he laughs, or during some of his attacks. Jevil is a short, pudgy imp with a round gray face, elven ears, clown-like eyes with small yellow pupils and black sclerae, and a large smiling mouth with yellow, sharp teeth.