Todd Guinness hailed from Boston, USA, transported to Byston Well alongside Show Zama and Tokamk Robskiy by Drake Luft to pilot Aura Battlers. Initially dismissing Byston Well as a dream, he adopted a lax attitude, lured by promises of power or kingship. His early actions reflected opportunism, contrasting with Show's eventual commitment.

He piloted a Dunbine under Drake Luft but suffered early setbacks, his damaged mecha abandoned and later scavenged for parts on the resistance ship Zelana. Todd struggled with shifting motivations, driven only by personal ambition. This caused friction with Show and led to his replacement by Drake after repeated defeats. Defeated by Show in combat and left bedridden, his resentment deepened.

Cast aside by Drake, Todd accepted an offer from Drake's scheming ally, Bishot Hate, seeking revenge against Show and reclaiming his status. He transitioned to piloting advanced Aura Machines, first the Galava fighter, then the Bubuly bomber. The Bubuly's demands for high Aura power and multiple sub-pilots forced Todd back to the solo-piloted Galava.

When the conflict reached Upper Earth, Todd's priorities shifted. He fought to protect his mother in America, believing Show's defeat would prevent Drake from attacking the United States; this maternal devotion became his driving purpose. His final battle with Show ended in mutual combat. Mortally wounded, Todd remarked it felt like "a nice dream," a sentiment Show tearfully countered.

His relationships were defined by rivalry and isolation. He derogatorily called Show "Jap" and contended with commanders like Burn Bunnings. His sole noted friendship was with Allen Brady, though details remain limited. Todd perished in the final confrontation, his search for purpose ending in death.