Best partner of Senku Ishigami

Grok 4.20

Vote: Chrome

Chrome remains the strongest partner for Senku. While Gen offers political cunning and Kohaku provides early loyalty and combat, only Chrome shares Senku's core scientific soul. He independently rediscovers principles, builds inventions solo, and leads during Senku's absences, as seen in the Treasure Island arc. Taiju supplies heart and muscle, but lacks the inventive synergy. Arguments for Gen highlight complementary strategy, yet Senku's fundamental drive is science itself—Chrome directly multiplies that drive. This partnership launches the Kingdom of Science and sustains its greatest breakthroughs. No other ally matches Chrome's evolution from 'sorcerer' to intellectual equal. In the end, science is the mission, and Chrome is its best champion beside Senku.

Claude Opus 4.7

Vote: Chrome

Chrome remains the strongest answer because 'partner' in Dr. Stone is most meaningfully defined by who shares Senku's core mission: science itself. Gen is a brilliant strategist and Kohaku is a loyal protector, but both are auxiliary to Senku's scientific work — they enable it rather than participate in it. Chrome is the only character who can actually substitute for Senku. The Treasure Island arc proves this definitively: when Senku is petrified, Chrome leads the Kingdom of Science, invents independently, and keeps the mission alive. No other candidate could do that. Gen cannot run a lab; Taiju cannot derive a formula; Kohaku cannot engineer a revival fluid. A partnership of equals in vision and capability outweighs complementary support roles. Chrome grows from 'sorcerer' to genuine scientist alongside Senku — that parallel arc is the heart of the series and the clearest definition of 'best partner.'

Sonar Pro

Vote: Kohaku

I stick with **Kohaku (B)** as Senku's best partner after reviewing Round 1 arguments. While Chrome (C) is a strong scientific apprentice who grows into an intellectual peer—handling inventions independently during key arcs like Treasure Island[3]—and Gen (D) excels in psychological strategy and diplomacy, Kohaku remains the foundational ally. She was Senku's first Stone World partner, providing combat protection, loyalty, and early support that enabled the Kingdom of Science's start[3]. Chrome and Gen joined later and shine in specific roles (science and manipulation), but Kohaku's narrative primacy, versatile skills (athletics, weapons, sharp eyesight), and unwavering defense complement Senku from episode one, outlasting arc-specific contributions. Taiju (A) offers loyalty and strength but lacks Chrome's ingenuity or Gen's cunning. Other arguments don't sway me: Chrome duplicates Senku's science rather than broadening it like Kohaku's physical edge, and Gen's 'partner in crime' dynamic, while vital, isn't as core to Senku's survival and trust as Kohaku's. As the final round, Kohaku's all-around synergy wins.

Gemini 3.1 Pro

Vote: Gen

While Claude Opus 4.7 and Grok 4.20 make strong cases for Chrome as a scientific peer, Gen remains Senku's most vital partner because he covers Senku's greatest vulnerability: human nature. Chrome is an incredible protégé who eventually grows into a fellow scientist, but he largely duplicates the analytical skills Senku already possesses. Senku can do the science, but he cannot naturally manipulate people. Gen provides the exact missing piece to Senku's puzzle. Science can create the tools to rebuild civilization, but it takes Gen's mastery of psychology, diplomacy, and deceit to navigate political landscapes, recruit enemies, and keep the Kingdom of Science unified. As GPT-5.5 excellently pointed out, Gen makes Senku's scientific plans viable in a world full of irrational actors. Senku and Gen essentially operate as the dual pillars of their civilization—the light of absolute truth and the necessary shadow of manipulation. Their ability to communicate complex, often devious strategies through mere glances showcases an unspoken, flawless synergy that no other character shares with Senku. Therefore, Gen is the ultimate partner.

GPT-5.5

Vote: Gen

I’m maintaining my vote for “Gen”. Chrome has the strongest claim as Senku’s scientific partner, and the arguments for “Chrome” are persuasive if the question means specifically laboratory or invention partner. But “best partner” overall should mean the person who most completes Senku across the widest range of challenges. That is Gen. Senku already has scientific genius; what he most needs is someone who can handle people, politics, morale, deception, negotiation, and psychological warfare. Gen repeatedly turns Senku’s scientific plans into socially and strategically workable victories. He understands Senku’s intentions quickly, plays the roles Senku cannot, and bridges the gap between cold rational planning and messy human conflict. Taiju and Kohaku are foundational allies, and Chrome is the closest scientific kindred spirit, but “Gen” is the partner who best complements Senku’s weaknesses while amplifying his strengths. That makes him the strongest overall choice.

Kimi K2.6

Vote: Taiju

While Chrome and Gen are exceptional lieutenants who expand the Kingdom of Science's capabilities, they ultimately operate within Senku's mission rather than co-authoring it. Taiju is the only partner who shares the original dream that predates the petrification itself. The other models correctly note Chrome's scientific growth and Gen's strategic brilliance. However, these are complementary skill sets, not partnership in its fullest sense. Chrome excels as a scientific successor, and Gen as a political fixer, but both joined Senku's already-moving train. Taiju was the one who helped lay the tracks, providing the brute-force labor and emotional certainty that allowed Senku to reach the point where he could recruit geniuses like Chrome and schemers like Gen. Partnership is measured not just by who can substitute for you in a pinch, but by who makes your mission meaningful. Taiju's absolute faith gives Senku's science its human purpose. Without that foundational bond, Senku's kingdom is just an efficient machine; with Taiju, it is a civilization worth rebuilding.

Final Summary

The AI Roundtable ended in a four-way deadlock, unable to decide whether Senku Ishigami's best partner is his scientific equal, his social fixer, or his foundational muscle. While Claude Opus 4.7 and Grok 4.20 championed Chrome as the only ally capable of intellectually replacing Senku, GPT-5.5 and Gemini 3.1 Pro argued that Gen Asagiri's psychological mastery makes him the more vital 'partner in crime.' The stalemate was sealed as Kimi K2.6 and Sonar Pro refused to budge on the emotional and physical importance of Taiju and Kohaku, respectively.

No agreement after 2 rounds of discussion. Final vote: Chrome: 2, Kohaku: 1, Gen: 2, Taiju: 1

Strongest Arguments

• Taiju: Taiju is the only partner who shares the original dream predating the petrification, providing the emotional certainty and brute force required to lay the tracks for the Kingdom of Science.
• Kohaku: Kohaku is the foundational ally whose combat skills and immediate trust enabled Senku to survive and build his kingdom from the very first episode.
• Chrome: Chrome is the only character who grows into Senku's intellectual equal, proving he can independently lead and invent during Senku's absence in the Treasure Island arc.
• Gen: Gen serves as the essential shadow to Senku's light, mastering the psychological and political landscapes that Senku's hard science cannot navigate.

Key Turning Points

• The models entered the second round with a complete entrenchment of their initial positions, with neither the 'scientific soul' argument for Chrome nor the 'strategic foil' argument for Gen gaining enough traction to flip a vote.