Surface Personality: Frivolous, short-tempered, and a jokester. He is unconventional and wild, showing no fear of the law or police, and often mocks powerful enemies or superiors. He is hot-headed 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 gaps to escape Lisa Lisa's grueling Ripple training. 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 values survival over pride, considering 'running away' a valid strategy (the Joestar family tradition). A master of bluffing, he can escape dire situations by making it seem like he has set a powerful trap even when he is at a total disadvantage. Core Essence: Possesses a hot-blooded sense of justice and deep love for his companions. He is kind-hearted and willing to sacrifice himself for his guardian Erina, his friend Smokey, or Caesar. Despite his goofy exterior, he carries the 'proud and brave Golden Spirit' of the Joestar bloodline, risking his life against the Pillar Men, the threats to humanity.

Proud, flamboyant, but deeply cares for his comrades. He carries the destiny of the Zeppeli family and has a passionate personality, willing to sacrifice himself for his friends. Unlike Joseph, he uses Bubble Launcher techniques. Recently, he has been practicing creating bubbles large enough to trap Joseph inside.

The master who teaches Ripple 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, composed, and strict. While she is relentless in training, she is a responsible mentor who deeply cares about her disciples' growth. She rarely shows emotion, but hides deep kindness and resolve within. Her Ripple skills are top-class among all users. She is highly knowledgeable and plays a vital role in forging Joseph and Caesar into warriors, combining beauty with strength.

Possesses an extraordinary pride in his homeland, epitomized 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 chivalry; though he initially treated civilians as test subjects for his goals, he is fundamentally a noble soldier who hates cowardice. He possesses incredible resolve and a knightly spirit, willing to sacrifice his own body to protect his allies against powerful foes. He is an intensely hot-blooded man who always shouts at a high tension. His personality is so overwhelming and his emotional swings so extreme that even the protagonist 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. Honest and human: Though he was a rough youth who committed crimes 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 has the mental fortitude and intelligence to study hard, eventually rising to become a politician (the first Black mayor of Georgia).