He likes to give other nicknames and has a personality akin to a child.
He was the "Earth" of the Elements, the elite, elemental-themed group of Burst Linkers belonging to Nega Nebulus. After Black Lotus reached Level 9 and the Certain Death Rule was revealed, Edge, who also had enough points to reach Level 9, decided against doing it.
According to Shinomiya Utai, he was stuck in an Infinite Enemy Kill at the northern gate of the Imperial Palace by Genbu and had been M.I.A since then.
It has been revealed he was already rescued and is currently the First Seat of the Six Layered Armor of Great Wall. His reason for joining them is because as a hostage deal with Green Grandee in exchange for providing protection for the surviving members of Nega Nebulus.
In Volume 18, it was revealed that the reason for his defection is that he made a deal with Green Grandee. In exchange for joining Great Wall, Green Grandee would shelter the surviving Nega Nebulus members in the Shouts area. It is also revealed that he is also the parent of Azure Heir and is together with him inside the Imperial Palace in the Unlimited Field.
«Twin Swords» - his skills in close combat are equal or even superior to Black Lotus, despite his defenses which are fragile. True to his namesake, his defense is so weak that even Ardor Maiden could defeat him in close combat. Both of his swords are made of Hyper Diamond, the hardest material in Accel World. But durability of his swords allow him to block almost any physical attack including Lotus' all-cutting slashes, so that's the reason behind a nickname «Anomaly».