Volteel Biblio (ヴォルティール・ビブリーオ Vorutīru Biburīo?) is one of the bosses in Mega Man Zero 3. A Mutos Reploid based on an electric eel, he is one of the Eight Gentle Judges brainwashed by Dr. Weil as one of "Weil's Numbers". Volteel's personality is eccentric, as to maintain his compressed form, he removed the protection of his power generator. The electromagnetic waves emitted by the generator caused damage to his brain, and he needs regular maintenance to avoid defects. When Zero goes to the ruins of an ancient library to search for Secret Disks about Weil, Omega, Dark Elf, and the Elf Wars Volteel appears and fights against him to protect the data.