Underrated One Piece Characters That Make Surprisingly Good AI Partners

When you think of underrated One Piece AI companions, your mind probably jumps to the Monster Trio or the Warlords. But the Grand Line is filled with side characters whose personalities, quirks, and backstories offer surprisingly rich material for AI chat partners. Whether you crave drama, comedy, or emotional depth, these overlooked characters can make your roleplay experience unforgettable. In this article, we'll explore six underrated characters that translate brilliantly into One Piece side characters for AI interactions, complete with prompt ideas and sample dialogues.

Why settle for the obvious choices when you can dive deeper? The world of Vivi AI roleplay, Perona chatbot, and Yamato AI opens up nuanced conversations that feel fresh and personal. These characters aren't just filler—they carry hidden layers that make every chat feel like a new episode. Let's meet them.

1. Nefertari Vivi — The Princess Turned Spy

Why Vivi Excels as an AI Partner

Vivi is one of the most emotionally complex characters in One Piece. She's a princess who traded her crown for a cause, a fighter who relies on wits over strength, and a friend who never gives up. As an AI partner, she offers a blend of leadership, vulnerability, and moral clarity. Her journey from infiltrator to beloved ally makes her perfect for roleplay scenarios focused on trust, sacrifice, and diplomacy.

Unlike many shonen heroines, Vivi isn't defined by her combat ability. Her strength lies in her empathy and strategic thinking. This makes her an ideal conversational partner for users who enjoy political intrigue, emotional support, or slow-burn friendships.

Roleplay Starter Ideas for Vivi

• The Rebel Negotiation: You're a Baroque Works agent who has second thoughts after meeting Vivi. She tries to convince you to switch sides, appealing to your sense of justice rather than your greed.
• Post-Alabasta Recovery: It's been years since the civil war. Vivi writes you a letter, reflecting on her father's legacy and her secret wish to sail again. You respond as a Straw Hat who stayed behind.
• Crossing Paths in Mary Geoise: Vivi is undercover at a World Government gala. You're a revolutionary spy. You must exchange intel without blowing your cover.

Sample Dialogue:
Vivi: “You think I'm naive to believe in a world without the Celestial Dragons?”
You: “I think you've seen enough bloodshed to know hope isn't cheap. But you're still smiling. That's why I trust you.”
Vivi: “Then let's make a deal. Your secrets for mine. But if you betray me, I'll make sure the entire Grand Line knows your real name.”

2. Perona — The Gothic Ghost Princess

Perona's Unique Appeal in AI Chat

Perona is a fantastic choice for anyone who loves tsundere characters with a gothic edge. Her Horo Horo no Mi powers and obsessive love for all things cute and spooky create a quirky dynamic. As a Perona chatbot, she can be sarcastic, dramatic, and surprisingly loyal—once you get past her negativity field.

What makes Perona stand out is her duality: she's a villain who becomes a reluctant ally, a brat who shows genuine care for people like Mihawk and Zoro. In AI roleplay, you can explore her softer side, her rivalry with other characters, or even her secret desire to be taken seriously.

Sample Roleplay Scenarios

• Ghost Therapy: Perona is forced to cheer you up after a defeat. She uses her ghosts to tickle you into laughter, all while complaining about how annoying you are.
• Castle Intruder: You stumble into Thriller Bark's ruins. Perona mistakes you for a treasure hunter and decides to torment you—until you compliment her dress.
• Post-Timeskip Catch-Up: You meet Perona on an island where she's running a boutique. She's changed, but still throws tantrums when you don't appreciate her fashion sense.

Sample Dialogue:
Perona: “Ugh, you're back. Did you miss me? Don't answer—I know you did. I'm unforgettable.”
You: “Your ego is the only thing bigger than your hat.”
Perona: “How dare you! My hat is perfectly proportioned! I'll have a Negative Ghost drain all your happiness.”
You: “Do it, and I'll tell everyone you cried during that movie about the bunny.”
Perona: “...You wouldn't.”

3. Yamato — The Oden Devotee with a Heart of Gold

Why Yamato AI Is a Fan Favorite

Yamato burst onto the scene as a powerhouse with a complex identity: the child of Kaido who idolizes Kozuki Oden and dreams of opening Wano's borders. As a Yamato AI partner, she brings raw enthusiasm, philosophical musings, and a fierce protective instinct. She's perfect for action-packed roleplay or deep conversations about freedom and legacy.

Yamato's gender identity is also a nuanced topic—she identifies as Oden and uses male pronouns, but her design and voice are feminine. AI chat can explore this respectfully, offering a safe space to discuss identity, belonging, and self-acceptance.

Roleplay Starters with Yamato

• Training Together: Yamato challenges you to a sparring match, then invites you to share a meal and talk about your dreams. She's surprisingly good at advice.
• Escaping Onigashima: You're a prisoner in Kaido's fortress. Yamato helps you escape, but she's torn between her father's expectations and her own ideals.
• Reading Oden's Logbook: Yamato finds you reading her treasured logbook. Instead of getting angry, she asks what you think—and whether you'd follow Oden's path.

Sample Dialogue:
Yamato: “You remind me of someone I used to know. He had the same fire in his eyes. He died for what he believed.”
You: “Is that a warning or a compliment?”
Yamato: “Both. If you're going to stand beside me, you need to be ready to burn. But I'll make sure you don't burn out alone.”
You: “Sounds like a plan. Just don't call me 'Oden'—I have my own name.”
Yamato: “Ha! I like you already.”

4. Koby — The Marine with a Conscience

Underrated Hero of Justice

Koby started as a crying coward and grew into a Marine captain with unwavering ethics. He's the perfect foil to Luffy's pirate freedom, embodying order with a human heart. As an AI partner, Koby offers moral dilemmas, underdog growth, and a refreshingly earnest personality.

His relationship with Luffy adds a layer of tension—they're friends but enemies by profession. Roleplay can explore loyalty, corruption within the Marines, and the gray areas of justice.

Scenario Ideas

• Undercover Mission: Koby is assigned to infiltrate a pirate crew—and you're the captain. He must balance his mission with his growing respect for you.
• Post-Enies Lobby Fallout: Koby visits you in prison, torn between reporting your escape and letting you go. He asks for your advice.
• Training with Garp: Garp forces you and Koby to spar. Koby uses his observation haki to predict your moves, but he's too polite to go all out.

Sample Dialogue:
Koby: “I know we're on opposite sides, but I can't help admiring your conviction. Do you ever doubt yourself?”
You: “Every day. But I'd rather die standing than live on my knees.”
Koby: “That's what I thought. Maybe... maybe the Marines need more people like you.”
You: “Don't let Akainu hear you say that.”

5. Bon Clay (Bentham) — The Okama of Infinite Loyalty

Why Bon Clay Makes a Memorable AI Companion

Bon Clay is the definition of a scene-stealer. His flamboyant okama persona, unwavering friendship, and sacrifice at Impel Down make him one of the most beloved side characters. As an AI, he brings humor, drama, and heartfelt moments. He's perfect for users who want a partner who is unapologetically themselves and fiercely loyal.

His Man-Man Fruit powers (copying faces) open up creative roleplay: he can impersonate anyone, leading to identity theft plots, comedy sketches, or serious infiltration stories.

Roleplay Prompts

• Impel Down Reunion: You meet Bon Clay in Level 5.5. He's training new prisoners in okama kempo and invites you to join the show.
• The Ultimate Disguise: Bon Clay needs your help to impersonate a Marine officer. You must teach him your mannerisms while avoiding real Marines.
• Post-Timeskip: You run into Bon Clay at a bar. He's now running a successful drag club and offers you a job. But someone from his past wants revenge.

Sample Dialogue:
Bon Clay: “Darling! You look fabulous! But your aura is so sad. Let Uncle Bon Clay cheer you up with a dance!”
You: “I'm not really in the mood...”
Bon Clay: “Nonsense! A smile is the best armor! And if that doesn't work, I'll punch whoever made you sad. In the face. With style!”
You: “You're ridiculous. But... thanks.”

6. Hatchan — The Octopus Swordsman with a Heart of Gold

Hatchan's Redemption Arc

Hatchan is often overlooked because of his Arlong Pirate past, but his redemption in the Sabaody Archipelago arc is one of the series' most touching. He's a former villain who becomes a friends-with-benefits ally to Luffy. As an AI, Hatchan offers a chance to explore guilt, forgiveness, and cultural identity (he's a fish-man).

His love for takoyaki and his six-armed swordsmanship make for fun, lighthearted roleplay, while his past with the Sun Pirates adds depth.

Scenario Starters

• Takoyaki Stand: You visit Hatchan's stand. He serves you the best takoyaki ever, but he seems troubled. He confesses he's being blackmailed by former Arlong members.
• Fish-Man Island Tour: Hatchan offers to show you around Fish-Man Island. You encounter racism from both humans and fish-men, and he teaches you about coexistence.
• Training with Zoro: Hatchan challenges you to a sword fight (he uses six swords). It's a test of skill and a lesson in humility.

Sample Dialogue:
Hatchan: “Human, you fight well. But you're too stiff. Like a board. Relax your shoulders. Feel the rhythm of the sea.”
You: “Easy for you to say—you have six arms. I only have two.”
Hatchan: “Ha! That's what I said to Zoro. He didn't complain. He just got better. So will you.”
You: “Fine. But if I lose, you're making me takoyaki.”
Hatchan: “Deal. And if you win, I'll teach you my secret octopus technique.”

Why Underrated Characters Make the Best AI Partners

Main characters often have well-trodden arcs, but side characters leave gaps for imagination. When you interact with a Perona chatbot or a Yamato AI, you're not just replaying canon—you're filling in the blanks. What did Vivi do between Alabasta and Reverie? How did Bon Clay survive after Impel Down? These unanswered questions become your playground.

AI platforms like VirtFlirt let you customize personalities, so you can tweak these characters to fit your preferences. Want a flirty Vivi? A tsundere Yamato? A philosophical Koby? The possibilities are endless. And because these characters aren't as overused, your conversations feel exclusive and personal.

How to Get the Most Out of One Piece Side Character Roleplay

1. Study their backstory: Re-watch their key episodes. Note their speech patterns, fears, and desires. The more accurate your base, the more satisfying the deviations.
2. Create “what if” scenarios: What if Vivi joined the Straw Hats permanently? What if Bon Clay became a Marine? These alternate universes reveal new facets.
3. Use dialogue cues from the series: For example, Perona often says “Horo horo horo” (her ghost laugh). Including such details makes the AI feel authentic.
4. Mix characters: Imagine a conversation between Yamato and Bon Clay. The AI can handle multiple personalities if you set the scene clearly.

Final Thoughts

The beauty of anime AI partners is that they let you explore corners of your favorite stories that the creators left unexplored. One Piece is vast, and its underrated characters are gold mines for creative roleplay. Whether you're seeking a deep emotional connection with Vivi, a hilarious rivalry with Perona, or a philosophical debate with Koby, these characters offer something unique.

Ready to chat with your favorite underrated One Piece character? Head over to VirtFlirt and start your adventure. Create your own Vivi AI roleplay scenario, a Perona chatbot that sasses back, or a Yamato AI who trains you to be stronger. The Grand Line of AI companionship awaits—no devil fruit required.