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Mamodo Partner
Byonko Alvin
ビョンコ Byonko アルヴィン Aruvin
Byonko and Alvin

Byonko (ビョンコ, Byonko) and Alvin (アルヴィン, Aruvin) are two fictional characters in the manga and anime series Zatch Bell!, and two of the major antagonists in the series along with Penny and Uri that join Zofis but later turn good towards the end of the second season. He uses Slime Magic.



Byonko is a talking frog mamodo from the Mamodo world. Byonko himself gets upset very easily and is always worried especially about making friends. During the battle, he is shown to be complimenting himself on how good his skills are instead of worrying about the enemy. At some point, he befriends Zofis and assists him in collecting the Ancient Mamodo that were locked away in a stone tablet but Zofis could revive them as his servants. Thinking that he and Zofis were friends, he along with Penny joined Zofis and became his first two assistants duos for the Ancient Mamodo. They held power over the ancient Mamodo and would give orders to them to attack and destroy Zatch and Kiyo along with their other friends.

Byonko's abilities are mainly slime based which matches up with his frog personality perfectly. It mostly has to do with stretching his limbs or shooting out bubbles made of slime. He is also shown to be extremely strong being able to knock down Demolt.


Alvin was a grumpy, old man from Madagascar who was trying to live out the rest of his life in peace by himself at his cottage located somewhere in a valley. One day he discovers Byonko who asks him to join him in his fight fo king, however, he declines which makes Byonko very upset. He is intrigued by the four leaf clover on Byonko's head calling it a "salad," and picks one of the leaves turning it permanently into a three leaf clover, as a result, Byonko gets more upset and cries even more. Alvin decides to team up with Byonko to make him "cool".

However, he does realize the intentions of Zofis and hence removes his false teeth, rendering him unable to use his spells properly and hindering himself and Byonko. However, once Byonko realizes the true nature of Zofis and switches over with Penny to Zatch's side, he puts on the false teeth once more, allowing Byonko to fight. He shed tears during his and Byonko's parting; when Byonko asks Alvin if he was "cool," Alvin responds that Byonko is "super cool."

List of Spells

Gigalolo Nyuruk
The Strechy Spell
Japanese Name: Gigaroro Nyururuku (ギガロロ・ニュルルク)
Type(s): Attack Episode: 82 Chapter: 152
Description: Byonko's hands and feet will stretch to an incredible size.
Known user(s):

Raja Nyusen
The Bubble Spell
Japanese Name: Rājia Nyurusen (ラージア・ニュルセン)
Type(s): Immobilization Episode: 82 Chapter: 153
Description: Creates numerous, slippery, green bubbles that make an enemy slip and fall. Used to prevent enemy from counterattacking.
Known user(s):

Gigano Nyushield
The Slime Shield Spell
Japanese Name: Gigano Nyushirudo (ギガノ・ニュシルド)
Type(s): Defense Episode: 82 Chapter: 153
Description: Byonko's strongest defensive spell. A green shield made of slime in the shape of a crown.
Known user(s):

Shin Nyushield
Reinforcement Spell
Japanese Name: Shin Nyushirudo (シン・ニュシルド)
Type(s): Assist Episode: N/A Chapter: 320
Description: Byonko's strongest spell, seen in Zatch's golden spellbook. A slimy membrane that is formed around a spell in order to reinforce its strength.
Known user(s):

Gigano Ribbisto
The Unknown Spell
Japanese Name: Gigano Gerosuto (ギガノ・ゲロスト)
Type(s): N/A Episode: 53 Chapter: 103
Description: An unknown spell that Byonko attempted to use to save Penny from Zatch's Bao Zakeruga. However, Byonko was unable to use it since Alvin was not present.
Known user(s):


  • Although Alvin's true age is never revealed, it can be assumed that he is the oldest Book Owner to appear in the fight.

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