The former Great Child of the 1st world, Primas, said to be the strongest among them all. After making Baku his successor, he heads to the Needle Tower as a Great Soldier. He not only helps the inhabitants of Primas, but also those of Secandas and Trius, which makes him admired and loved by many people. His G.C. license is the ∞ and he also uses dual swords as weapons.
His true identity is to be a prince from another planet, he and his sister along with other refugees fled a war and ended up in Twelve World using the Needle Tower as a space ship. In the anime, it was Zan who destroyed his homeland.
In the manga, it is revealed that En is Baku's uncle and the main antagonist. Traumatized by having watched the destruction of his people without being able to help, En grew up with a huge desire to become as strong as his childhood hero and protector, Shin, and orchestrated a plan to conquer his new world and the universe.
At first, princess Amano soon discovered her younger brother's plans and sealed him with her in a cryogenic sleep inside the tower, but En managed to awaken and kept her asleep all this time so that she wouldn't interfere with his plans.
Using his own sister and her powers as an energy source, En created the Tree of Zero in the center of the Needle Tower, whose roots spread the Awakening Poison throughout the Twelve Worlds. Afterwards, he created the entire Great Childs and Great Soldiers security system along with the Twelve Spirits, who were programmed to memorize their warriors' skills and techniques and transmit them back to the Needle Tower, so that En could copy them and became even more stronger. En also built a legion of robots known as "Zero Type Soldiers", which also use the techniques he copied.
