Ze-ro

Zeero is a new generation duelist introduced in Duel Masters (2017) season of the Duel Masters Anime.

He is the Duel Master of the Darkness Civilization and likely the main antagonist of the new arc.

Details
An ominous and demonic looking man with green hair, white skin and a cape with a constellation on it. Not much is known about him but he seems to have the mentality and speech patterns of a baby, as shown with his stuttering, incomplete speech patterns and immature personality. He also has a short attention span and simply lies around flipping his cards when he doesn't do anything.

However, he has a very fast learning curve and is capable of knowing the basic rules and overwhelming a would-be nearly invincible opponent in just one duel, and his personality seem to get more sinister as things progress, although it is still sinister in a very childish way for the first time around.

His caretaker, a sinister looking dwarf resides inside his cape which hands out most of the orders. This caretaker is more sinister in personality and has more complete speech patterns, while the duel warrior of Mukade, Asura, Kejisuki acts as his right hand man.

Very little is known about him and despite that he is very likely to have ntagonistic intentions, they weren't revealed yet.

Anime
He appeared in episode 44 of the Duel Masters (2017) season, in a duel against Kira. In that duel, Kira used his labyrinth duel tactics against him and he is unable to play by the rules of the game or even talk at first, but he quickly learnt the rulings of Gate of Moonless Night and sent out 卍 De Szak 卍 and force tap in his blockers. Kira managed to send out Kirazeus Savaak to remove it, but due to a shield trigger Duglass, Darma Kirazeus was destroyed and he ordered a direct attack only to stop it because he was having fun with Kira.

He is not seen until later on where he invaded the Nature Civilization grounds then summoned a black portal to suck Bonto in. He challenges Bonto to a true duel and Bonto gets around his De Rupansa by sending Geostadio, Dragon Armored, but he used 卍 De Szak 卍 to force Bontobolt to enter the battle zone tapped and won, only eating one attack. While Zeero issued a direct attack against him while laughing sadistically on the floor, Kabutoki went into the dueling area to save Bonto but he was already mortally wounded.

Deck
He uses a Darkness Civilization deck based on Mafi Gang and Master Dolszak.