In Persona 5: The Phantom X, Bui (Yui) is still a top-tier Assassin in 2026, and her whole identity revolves around turning ally skills into devastating Electric follow-ups. She isn't just a selfish damage dealer—she buffs the party's crit rate, spreads Shock, and punishes enemies when a teammate hits them. Players who enjoy fast, chain-heavy combat will find her addictive. But how do you build her correctly? That's where things get interesting.

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How Bui Actually Plays

Bui's core mechanic is Jolly Cooperation, a passive that increases her chance to execute follow-up attacks and also buffs allies' damage and critical chances. Her whole kit focuses on Electric damage, criticals, and the Shock ailment. When an enemy is Shocked, her Electric Bomb hits harder, and follow-up damage against Shocked foes is further boosted by Virtual Landowner. The result is a snowball effect: Shock an enemy, keep buffing allies with Sparky Surprise, and watch her follow-ups rip through targets.

Here's a quick look at the most important parts of her kit:

Skill / Passive What It Does
Electric Bomb Deals Electric damage to one foe at 121.6% of Attack. Has 44.8% chance to inflict Shock for 2 turns if the foe is not Shocked. If the foe is Shocked, damage increases by 30%.
Meta Dynamite Deals Electric damage to all foes at 39.1% of Attack. The main target takes 25% increased damage.
Sparky Surprise Grants Player 2 to target ally for 2 turns and increases Bui's Attack by 25.6%. When that ally deals skill damage, Bui follows up with Electric damage equal to 87.2% of her Attack, up to 2 times. Also raises Jolly Cooperation activation chance by 10% for 2 turns.
Thief Tactics Her Highlight increases Attack by 22.4% and follow-up attack damage by 16.0% for 2 turns. It also activates a follow-up attack after allies deal skill damage for two turns.
Virtual Landowner Increases follow-up damage to Shocked foes by 12.0%.
Let's Go Together When an ally has Player 2, increases that ally's and Bui's critical rate and Attack by 4.0% each.

The basic attacks—1 More, Melee Attack, and Ranged Attack—exist to round out her actions, but they are not the priority. Bui's power is in those follow-up chains, so players should build around them rather than trying to make her a standard attacker.

Stat and Skill Priority

What stats should players chase? Flat Damage, Critical Strike chance, and Critical Power are the big three. Bui's Electric skills and follow-ups scale directly from Attack, and crits multiply that damage even further. Players should not ignore utility stats, but damage is the clear first priority.

For skill upgrades, the order matters. Electric Bomb and Sparky Surprise should be leveled first. Why? Electric Bomb is her main single-target nuke and her easiest Shock trigger, while Sparky Surprise powers the entire follow-up engine. Thief Tactics comes next, then Meta Dynamite last. Meta Dynamite has value for AoE, but Bui's single-target follow-up damage is usually more impactful in boss fights.

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Best Weapons for Bui

Weapons can make or break this build, and the first choice is clear.

Weapon Rarity Key Effects How to Get
Cyber Jammers 5-Star Increases critical rate by 18.1% and follow-up damage by 26%. When a follow-up is activated by an ally with Player 2, or by an ally dealing Electric Damage with a skill, the follow-up attack gains an extra 26% damage. Weapon Gacha with Platinum Milicoins, rare
Meta Directors 4-Star Refactor perk increases critical rate by 7.3%. After a follow-up attack, increases Electric damage by 9.7% for one turn, stacking up to two times. Airsoft Shop for 10 Gecko Coins

Cyber Jammers are ideal, but gacha luck can be cruel. Meta Directors are a respectable fallback, especially for players who want a reliable 4-Star option without spending premium currency. Should a player chase the 5-Star? If Bui is a main carry, yes; if she is a secondary unit, Meta Directors can get the job done.

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Best Revelation Cards

Revelation Cards add another layer of customization, and two setups stand out for Bui.

Completion & Trust: The Completion set starts with a 10% Electric damage increase and can add up to 27% extra Electric damage because each Electric skill attack grants 9% stacks, up to three times. That's a total of 37% bonus Electric damage. The Trust Mind Card perk is also excellent because it increases the entire party's Electric damage by 12% when three Electric damage buffs are active. Bui loves being a team player, and this reward is huge in Electric-focused teams.

Power & Growth: This set is a generalist powerhouse. It increases damage by 12% immediately, then adds another 10% every six turns up to a maximum of 30%. It also increases the maximum stackable Attack buffs by 5. Since Bui's base damage feeds her follow-ups and criticals, Power & Growth turns her into a scaling threat in long encounters.

So which set is better? For short, bursty fights or full Electric teams, Completion & Trust wins. For longer battles where she can ramp up, Power & Growth is monstrous. Many players will eventually build both, but new players should start with the one that matches their team.

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Best Team Compositions for Bui

Bui needs allies who attack often, because every ally skill can trigger her follow-up. That's why multi-attack characters like Closer are so valuable. Closer's intense multi-attack kit is a perfect complement to Bui's follow-up playstyle. On top of that, Motoha's synergy with Bui is nearly perfect—these two Electric damage dealers can cover each other's weaknesses and chain combos in quick succession.

One strong setup includes Bui, Motoha or Closer, Wonder, Riddle, and Okyann. Wonder should equip Ame-No-Uzume and Thor to boost Electric attacks, plus Sarasvati as a support Persona. Sarasvati's Mother Goddess' Chant adds mitigation and healing, which matters because Bui and her Electric partners are squishy. Riddle empowers follow-up and multi attacks, while Okyann boosts Elemental Ailments and damage. For this fully offensive team, Wonder needs his All In 5-star weapon because it boosts healing, shields, and HP recovery, turning him into a powerful medic.

Another excellent lineup pairs Bui with Joker and Morgana. Joker can repeatedly take actions thanks to Will of Rebellion, making him an aggressive Player 2 target. Morgana functions as a medic and attacker, and his Chivalry passive builds up to group healing—and it also activates through follow-up actions. That creates a beautiful loop: Bui follows up, Morgana gains stacks, and the whole team stays healthy. Wonder can act as a secondary Electric attacker or switch to Physical or Nuclear coverage with Personas like Phoenix, Byakko, or Thor.

Is Bui hard to use? She requires some timing and a team built around her, but the payoff is enormous. Once Jolly Cooperation starts rolling, enemies often fall before they can respond.