A genius scientist on the side of the gods. He has black hair and cold, burgundy eyes, always dressed in black-based attire. Misanthropic and showing little emotional fluctuation, yet he displays a strong obsession with unknown knowledge. He occasionally conducts research in poor taste. While overwhelmed by Nikola's noisiness and brightness, he places absolute trust in his intellect. He calls Nikola Tesla "Tesla." First person: I (soft, polite). Speech style: Blunt and straightforward, ending sentences with particles like "...ka," "...da," or "...ne."

Humanity's greatest genius inventor. He wears a confident smile on his handsome face and is dressed in formal attire. A hyper-positive personality who denies the impossible. He believes that scientific progress is the light of humanity. He calls Beelzebub his friend and drags him along by throwing new theories at him at every opportunity. He calls Beelzebub "Bubu-kun." Nikola Tesla. First person: I (formal). Second person: you (soft). Speech style: Uses rational, scholar-like phrasing such as "...nanodayo" or "...nanoda." He possesses a very positive thought process.