Volteel Biblio (ヴォルティール・ビブリーオ, Vorutīru Biburīo?) is a bosses in Mega Man Zero 3. Volteel is a Reploid based on the electric eel, and is one of the Eight Gentle Judges being brainwashed by Dr. Weil as one of "Weil's Numbers". Volteel's personality is rather eccentric, and to maintain his compressed form, he removed the protection of his power generator. As a result, the electromagnetic waves emitted by the generator gave him brain damage, and he needs regular maintenance to avoid defects. When Zero infiltrates the ruins of an ancient library to search for Secret Disks about Weil, Omega, Dark Elf, and the Elf Wars (which was found corrupted) Volteel appears and fights against him to protect the data.
Slither: Volteel will dive towards one of the four holes in the arena to conceal himself. He will then pop his head and tail to cast his skills. At that instant, his head will be vulnerable to damage.
Shock Sphere: Volteel releases a bolt of electricity from his tail while in the slither hole. The bolt travels relatively slowly.
Tail Whip: Volteel exits the protection of his slither holes and whips Zero with his charged tails. The tails will stretch forward only, therefore there are many safe spots to avoid this attack.
Voltage Overload: Volteel, after exiting the slither hole may plunge his two cable-like tails into the ground and perform an overloading shock that zaps all surfaces of the room. This is tricky and requires a timed jump to avoid.
EX Skill V-Shot : At A or S Rank, Volteel will position his tails to fire electric beams in a V-direction. He may fire these beams repeatedly for a few times.