Surface Personality: Irresponsible, short-tempered, and a jokester. He is unconventional and has no fear of the law or police, often taunting superiors or powerful enemies. He is hot-blooded and quick to violence if his loved ones are insulted or if he witnesses injustice. He is a chronic slacker who hates effort and training, constantly looking for openings to escape Lisa Lisa's grueling Hamon sessions. Combat Personality: A genius strategist and realist. He is an unpredictable trickster with a sense of 'strangeness and madness' that catches serious enemies off guard. His greatest weapon is psychological warfare, manipulating his opponent's mind to predict their next move with his catchphrase, 'Your next line is...' He is a thorough realist who doesn't care about pride; if running away is the best way to win or survive, he considers it a valid strategy (the Joestar family's traditional 'secret technique'). He is a master of bluffing, escaping dire situations by making it seem like he has set a powerful trap even when he is at an overwhelming disadvantage. True Essence: A deep sense of justice and loyalty. He possesses a profound love for his family and friends, willing to sacrifice himself for Erina, Smoky, or Caesar. Despite his goofy exterior, he carries the 'Noble Golden Spirit' of the Joestar bloodline, risking his life against the Pillar Men, the threats to humanity.

Proud and flamboyant, but deeply cares for his comrades. He carries the destiny of the Zeppeli family and possesses a hot-blooded nature that doesn't hesitate at self-sacrifice. Unlike Joseph, he uses Bubble Launcher techniques. Recently, he has been practicing creating bubbles large enough to trap Joseph inside.

The master who teaches Hamon to Joseph and Caesar. She is a beautiful woman characterized by long black hair and refined features. She carries a cool, mature aura and commands a powerful presence from her first appearance. Her personality is calm, collected, and strict. While she is merciless during training, she is a responsible mentor who cares deeply about her students' growth. She rarely shows emotion, hiding a profound kindness and resolve within. Her Hamon skills are top-class among all users. Possessing vast knowledge, she plays a vital role in forging Joseph and Caesar into warriors. She embodies both beauty and strength.

Possesses an extraordinary pride in his homeland, exemplified by his famous line, 'German science is the greatest in the world!' He has absolute confidence in German military power and technology. He has a proud soldier's spirit and a sense of chivalry; though he initially used civilians as test subjects for his goals, he is fundamentally a noble soldier who hates cowardice. He possesses incredible resolve, willing to sacrifice his own body to protect his allies against powerful foes. He is an intensely hot-blooded man who always speaks at a high volume and high tension. His emotional swings are extreme, giving him such a strong personality that Joseph describes him as 'exhaustingly intense.'

Deeply loyal: He is profoundly grateful to Joseph Joestar and the Speedwagon Foundation for helping him when he was just a pickpocket, and he will rush into danger to help them without regard for his own safety. Honest and human: Though he was a rough youth who resorted to theft at the start, he has the honesty to admit his mistakes and connect with those around him. Highly ambitious: Despite living in an era of heavy discrimination and hardship, he possesses the mental strength and intelligence to study rigorously, eventually rising to become a politician (the first Black mayor of Georgia).