Veldora Tempest, the Storm Dragon, stands among the five True Dragons, born as chaos incarnate wielding authority over wind, water, and space. His existence shaped world events for millennia, marked by immense power and destructive rampages fueled by boredom and restlessness, cementing his reputation as a catastrophic force. Sealed within a cave roughly 300 years before the main events by the hero Chronoa using Infinity Prison, he endured prolonged isolation.

Initially boisterous, excitable, and prone to impulsive destruction, Veldora concealed deep loneliness and social awkwardness. His encounter with Rimuru, a reincarnated slime, within the cave transformed him. They forged a pact: Veldora bestowed his name and powers upon Rimuru, who absorbed the dragon into his stomach to circumvent the seal. Accessing Rimuru's memories of manga and modern media—dubbed "sacred texts"—Veldora reshaped his worldview, curbing his destructive impulses and cultivating patience and analytical thinking. He formed an unbreakable bond with Rimuru, viewing him as his first true friend and equal.

Revived through a clone body after Rimuru's evolution into a Demon Lord, Veldora adopted a human form—tall, muscular, and blond, with an intimidating presence he could suppress to appear ordinary. Post-revival, he exhibited childlike enthusiasm, pride in his strength, and a habit of quoting manga in daily exchanges. Despite his fearsome legacy, he acted meek around his elder sisters Velzard and Velgrynd due to past trauma from their conflicts. His social awkwardness persisted, often making requests that unintentionally intimidated others into compliance.

Veldora commands colossal magical energy, elemental storm control, and the Ultimate Skill "Faust" (later "Lord of Chaos"), granting enhanced analysis, probability manipulation, and near-immortality linked to Rimuru. He wields techniques like "Death Wind," "Black Thunder," and "Ruin Tempest," and invents combat styles such as "Veldora-Style Martial Arts," inspired by manga. His True Dragon nature grants resistance to existence erasure, soul manipulation, and most assaults.

Relationships define his growth: Rimuru remains his closest ally, their shared surname "Tempest" symbolizing their bond. He shares a comical rivalry with Luminous Valentine, whose city he once destroyed, and a playful yet cautious dynamic with his niece Milim Nava. He befriends Ramiris over manga and mentors the flame spirit Ifrit (later Charys) within Rimuru’s stomach. Despite progress, he retains a tsundere demeanor—proud yet secretly craving validation—leading others to perceive Rimuru as having "tamed" him.

In daily life, Veldora expends excess energy as Tempest’s dungeon "last boss," operates a takoyaki stand during festivals with unexpected culinary skill, and inadvertently disrupts plans through misunderstandings. His arc reflects a journey from isolation to integration, balancing divine power with humanizing flaws.