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Flame is a small digital humanoid being. When not in a solid form, his body is red prism-like data. Like Ai, a fellow Ignis, Flame has markings over his black body, in flame shaped lines, which are tinted with a red color.
Unlike Ai who is quick to panic or pull jokes, Flame is a level-headed Ignis who speaks with an even voice.
As an Ignis, Flame is an AI with free will and has a degree of control over the Cyberse and can create Cyberse Monsters. In Ai's flashback of his fellow Ignis, Flame is associated with fire and the Duel Monster Attribute of the same name.
Like with Ai, Flame can lend his abilities to the human he's in possession of. Flame's skill is "Burning Draw", which he lends to Takeru.
Flame and the other Ignis were created by Dr. Kogami to be the saviors of humanity. Like his fellow Ignis, Flame evolved and they created the Cyberse World, as well as the Cyberse monsters. Their progress worried Dr. Kogami, who predicted the AI and humanity would become enemies, who created Ignis to help humanity instead. Despite this, Flame and the other Ignis continued developing the Cyberse World. Flame's sector of Cyberse is a large, active volcano. In Ai's words, the Ignis would never try harm humanity, and would rather live in their own world.
Varis launched an attack to Cyberse with three of his "Cracking Dragons". The entities of Cyberse, including Flame, were sealed off and could not retaliate, except for Ai. Varis and the "Cracking Dragon" chased Ai, who escaped Cyberse and severed the connection with that place. Others realized he wanted to hide Cyberse at the price being unable to return. Just as Ai succeeded and gloated, Varis' "Cracking Dragon" ate him, though his eye was lost in the network. Varis had his team search for Ai's remains, for only he knew the location of Cyberse.
Soulburner pointed out he found Flame's friend. Flame did not wish to be called Ai's friend, seeing that Ignis cowering in fear. When Playmaker was stopped by Bit and Boot, Soulburner, in a fiery whirlwind, appeared with Flame. He let Playmaker continue, as he went to deal with Bit and Boot himself. Flame was relieved it could help Soulburner out, who promised to burn away his enemies.