Byonko is a talking frog mamado from the Mamodo world. Byonko himself gets upset very easily and is always worried especially about making friends. During battle he is shown to be complimenting himself on how good his skills are instead of worring about the enemy.    ~!At some point he befriends Zofis and assists him in collecting the Ancient Mamado that were locked away in 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 assisstant duos for the Ancient Mamado. They held power over the ancient Mamado 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 out of slime. He is also shown to be extremley strong being able to knock down Demolt.  Spells Gigano Ribbisto: 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. (Attack) Gigaro Nyururuk: Byonko's hands and feet will stretch to an incredible size. (Attack) Raja Nyurusen: Creates numerous, slippery, green bubbles that make an enemy slip and fall. Used to prevent enemy from counterattacking. (Immobilization) Giga Nyushield: A green shield made of slime in the shape of a crown. (Defense) Shin Nyushield: 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. (Assist)  Source: ZatchBell Wiki

Takamine Kiyomaro, a depressed don't-care-about-the-world guy, was suddenly given a little demon named Gash Bell to take care of. Little does he know that Gash is embroiled into an intense fight to see who is the ruler of the demon world. All of the demons have to pick a master on Earth and duke it out with other demons until one survives. Needless to say, Kiyomaro becomes Gash's master, and through their many battles, Kiyomaro learns the importance of friendship and courage. 

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