Belgim E.O. (ベルギム・Ｅ・Ｏ, Berugimu Ī Ō), one of the Four Supreme Mamodo, and his present-day bookkeeper Dalia Anjé (ダリア・アンジェ, Daria Anje) are confronted by Kanchomé and Parco Folgore and Kido and Dr. Riddles in the ruins. Belgim E.O. sits on an oversized throne and rarely moves from it, although he is capable of standing on his own. He uses Ghost Magic. Dalia Anjé is not controlled by Zofis, but seems genuinely insane, as her only dialog outside of reading spells is mad laughter (and one scream when she saw Kanchomé's Dika Poruk spell.) Belgim E.O. is very powerful, but easily appeased if he is entertained, although if he becomes bored, he gets angry and attacks.
Belgim is eventually defeated by Kido's most powerful spell, Mikor Ma Zegaruga, although Kido's own book is burned in the process.
Belgim E.O. is later seen in the final chapter of the manga as a new student in Zatch's school of the same grade and classroom for a particular class.
Belgim E.O. has gray skin, fiery yellow-orange eyes (but no eyeballs) and a facial appearance which makes him look like a skeleton. He also wears a black and orange striped headdress and a matching kilt. The end of his kilt is ripped. He also wears pointy orange shoes and a kind of purple armor which appears to cover part of his chest. He also has two large, Frankenstein Monster-styled bolts sticking into his shoulders. His oversized throne is also the same color as his skin.
Dalia has black hair with dark purple highlights and lime green eyes. She wears a dark pink dress. In episode 89, she wears a white and dark blue sailor dress with a red scarf.
The "E.O." stands for Intolerant Overlord. In the Japanese version, it stands for "Isu" (椅子), meaning chair, which starts with the hard E sound, and Oshioki (お仕置き), meaning punishment, which starts with the hard O sound.