A perverted lingerie thief, a common trope in manga for male characters, Chamo is a chain-smoking, talking ermine with a long, prehensile tail. Negi freed him from a trap when he was just five years old. Since then, Chamo has come to Negi's aid whenever he faced trouble.
Chamo deeply cares for Negi and will fiercely protect him, but he isn't above exploiting Negi for quick money. His main scheme involves facilitating provisional contracts between Negi and as many of his students as possible, earning 50,000 Ermine Dollars for each contract.
Often acting as Negi's trusted advisor, Chamo provides guidance on most matters. However, his judgment and advice can sometimes be questionable. He excels at analyzing dangerous situations and devising countermeasures when others are panicking, though his plans frequently have significant flaws, which he admits bluntly. Chamo is also adept at assessing individual strengths and personalities, utilizing this knowledge effectively during crises.
Whenever his schemes are uncovered or he gets caught in one of his perverted acts, Chamo often faces Asuna's wrath.
Interestingly, being turned into an ermine is a punishment at Negi's magic academy, but Chamo is not a mage transformed into an ermine. Instead, he is a type of elf, fairy, or Cait Sith, which he proudly claims to be.
