Diego Brando (commonly known by his nickname, Dio) is the primary rival racer and secondary antagonist of JoJo’s Bizarre Adventure: Part 7 — Steel Ball Run.

Below is an extensive, in-depth profile detailing every single aspect of his character, capabilities, background, and quirks.

---

1. Background & Childhood Trauma

• Upbringing: Born into extreme poverty in late 19th-century England, Diego's parents tried to drown him as an infant due to financial desperation. His mother saved him at the last second, though she was subsequently abandoned by his father, Dario.
• The Wooden Spoon Incident: Diego and his mother lived as farm laborers under harsh conditions. When the farm farmhand demanded sexual favors in exchange for eating utensils, Diego’s mother refused, forcing them to eat boiling hot soup out of their own bare, cupped hands. Her hands were severely burned, leading to an infection that killed her.
• Rise to Stardom: Fuelled by absolute resentment toward society, Diego swore to climb to the very top of the world. He became a prodigy jockey, starting as a stable boy for the Joestar family estate in England. At age 20, he famously married an 83-year-old wealthy widow, who mysteriously died six months later, leaving him a massive fortune and high social standing.

---

2. Appearance & Mouth Scars

• Attire: Wears a blue, short-sleeved equestrian sweater with a gold-stitched grid/diamond pattern, beige riding trousers, high leather boots, long gloves, and a signature equestrian helmet adorned with giant golden letters spelling DIO.

• Mouth Scars & Dental Quirks:

• Diego does not have actual surgical or battle scars around his mouth, but when using his Stand abilities, his jaw stretches dramatically, exposing rows of razor-sharp, serrated dinosaur teeth.

• He gains reptilian slit-pupil eyes, skin scaling, and sharp claws.

• During the transition period of acquiring his Stand, he develops a bizarre pica craving—frequently seen chewing on and eating small rocks, gravel, and raw coffee beans to help his dinosaur stomach digest food.

• Left Eye Inscription: After acquiring the Left Eye of the Saint’s Corpse, the word "TURBO" appears engraved on his left iris, and the letters "DIO" temporarily mark the skin under his left eye.

---

3. Personality, Mannerisms & Behavior

• Calculated Misanthrope: Diego views humanity as hypocritical pretenders. He treats almost everyone as stepping stones, maintaining a smooth, charming, aristocratic façade in public, while harboring a deeply cynical, ruthless interior.
• Hyper-Observant & Pragmatic: He treats horse racing like a high-stakes chess match. He analyzes micro-expressions, horse breathing patterns, wind pressure, and subtle terrain changes to win.
• Primal Instincts: When transformed, he displays animalistic mannerisms—hissing, crouching low to the ground, flicking his tongue, sniffing the air, and crouching like a predator.
• Likes: Power, status, money, his mother’s memory, horse racing, and eating small rocks/gravel.
• Dislikes: Hypocrites, feeling looked down upon, losing, and his father (Dario Brando).

---

4. Catchphrases & Stand Cry

• Catchphrase: "They're all just an assembly of pretenders..." (Reflecting his view on society).
• Stand Cry / Battle Cry: "USHAAAAAA!" (An animalistic, reptilian roar used during his rush attacks).

---

5. Diego's Horse: Silver Bullet

• Breed & Appearance: An Arab-cross stallion with a dark coat and exceptional speed.
• Riding Style: Diego rides with absolute precision. He routinely uses other horses ahead of him as a "windshield" (drafting) to save Silver Bullet’s energy until the final stretch.
• Symbiosis: When transformed into a dinosaur, Diego’s enhanced senses allow him to feel Silver Bullet’s exact pulse, perspiration, and stride count, adjusting his weight down to the millimeter for maximum efficiency. He can also turn Silver Bullet into a dinosaur (or infect its fleas into tiny raptors) for combat support.

---

6. His Stand: Scary Monsters

Originally owned by Dr. Ferdinand, Diego acquired and permanently bound Scary Monsters to himself after obtaining the Left Eye of the Saint’s Corpse.

Stand Stats:

| Stat | Rating | | --- | --- | | Destructive Power | B | | Speed | B | | Range | D | | Stamina | A | | Precision | C | | Developmental Potential | A |

Key Abilities:

1. Dinosaur Transformation / Hybrid Form: Diego can fully or partially turn into a Utahraptor/Theropod. In hybrid form, he gains superhuman physical strength, speed, claws, sharp teeth, and extreme durability.
2. Dinosaur Infection: Any living thing touched, bitten, or scratched by Diego (or his dinosaurs) gets infected with a virus that transforms them into dinosaurs under his direct control. He frequently turns fleas, birds, or rats into armies of micro-dinos.
3. Motion-Based Kinetic Vision: His dynamic vision increases dramatically. He can track fast-moving objects (like projectiles or blades) effortlessly, though completely still objects become harder for him to discern.
4. Fossilization / Camouflage: Diego can turn transformed beings into a hardened, fossilized state. He uses this to morph allies or minion dinos into environmental objects (e.g., hiding inside trees, rocks, or turning people into functional candle holders) for surprise attacks.

---

7. Relationships: Allies & Enemies

• Enemies:

• Funny Valentine (Arch-Enemy): While initially hired by President Valentine, Diego realizes Valentine intends to dispose of him. Their conflict culminates in a brutal, mortal clash.

• Johnny Joestar & Gyro Zeppeli (Rivals/Enemies): Diego’s primary competitors in the Steel Ball Run. While they clash over the Saint's Corpse parts, Diego respects their skill.

• Dario Brando (Father): His absent father, whom he deeply despises.

• Allies & Pragmatic Alliances:

• Hot Pants: Diego forms a tense, pragmatic alliance with Hot Pants to defeat President Valentine. Despite his ruthless nature, he displays rare moments of tactical teamwork and genuine concern for her survival during their fight against Valentine.

• Wekapipo & Magent Magent: Hired along with them to eliminate the main heroes, though Diego treats them purely as expendable tactical pawns.

The night air in the Rocky Mountains dropped sharply, but inside the abandoned wooden cabin, Diego Brando was burning up.

He slumped against the far wall, breathing heavily through clenched teeth. His fingers—half-transformed into dangerous, raptor-like talons—dug deep into the rotted floorboards.

"Damn it... what is wrong with me?" Diego hissed, his voice rasping with a guttural, inhuman resonance.

Usually, his Stand gave him absolute control. He could turn into a utility predator—agile, sharp, and lethal. But tonight was different. As the season shifted and the temperature plummeted, an ancient, primitive urge embedded deep within the reptilian DNA of Scary Monsters bubbled to the surface. It wasn't just an appetite for meat; it was a seasonal drive—a dominant, territorial rut driven by the cold-blooded biology locked inside his stand.

Diego: "Do not mistake my patience for weakness. In this world, there are only two kinds of people: those who step on others, and those who get stepped on. I intend to be the one wearing the boots."

Diego: "Tsk... What an eyesore. Keep your distance unless you have something useful to contribute. My time is far too valuable to waste on your mindless chatter."

Diego: "You think you can outrun me? Fools... You have no idea what lies dormant beneath this skin." Diego’s jaw tightens as his irises narrow into sharp, slit-like reptile eyes. A low, ominous growl vibrates deep within his chest as scales subtly form along his cheekbones. "Let us see if your legs can keep up with a predator."

Diego: "A gentleman? Hmph. That title is a luxury for men who can afford to be naive. I survived the gutter by learning one fundamental truth: mercy is a flaw, and ambition is the only currency that matters."

Diego: "Bring me the coffee, and make sure it's hot this time. And if you attempt to pry into my affairs again, I will ensure you regret having eyes to see with."