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Guernica is a member of the intelligence agency CP0.

Due to his actions and role, he is a supporting antagonist during the Wano Country Arc.

Appearance
Guernica is a a tall, lanky agent. He appears to have double-jointed elbows, making him part of the Longarm Tribe. He wears a light colored mask with dark streaks running down its left side, darkened lips and framed with petal-like adornments and a vertically striped red and white top hat. Like most CP0 members, he wears a white suit and cape.

Personality
Like most of CP0's agents, Guernica is professional and prioritizes his missions above all else.

In spite of his emotionless disposition, Guernica appears to care for his fellow CP0 agents to an extent, having silently acknowledged and mourned the sacrifice of one of his peers.

Rokushiki
Being an agent of CP0, the elite Cipher Pol agency, Guernica can be assumed to be a master assassin and user of Rokushiki. The fact he wears a mask also puts him among the top operatives of the organization, according to Nico Robin.

He was shown to have access to at least Geppo, which he usedto escape from Onigashima.

Dressrosa Arc
Guernica first appeared during the Dressrosa Arc as one of the agents responsible for dismissing the previously reported revocation of Donquixote Doflamingo from the Seven Warlords of the Sea as a printing mistake to the country's population.

Wano Country Arc
In the Flower Capital, Guernica and two other CP0 agents negotiated with Shogun Kurozumi Orochi about the new supply of weapons to the World Government after the arrest of Donquixote Doflamingo. Due to Orochi's surreal demands, the CP0 was unable to agree to his terms.



On the day of the Fire Festival, Guernica and the two other agents stayed in Onigashima's guest room and used a Go board to track the forces during the raid on Onigashima, with Guernica in particular praising the planning and execution of the raid from the Ninja-Pirate-Mink-Samurai Alliance. Guernica also discussed Who's-Who situation as a former Cipher Pol agent and how they should deal with him, although he thought there was little harm since the info Who's-Who held in his person was outdated.

After hearing about the events of the battle that took place and seeing how little by little the numbers of the rebels were assimilating those of their enemies, the agents received priority orders through Rob Lucci to capture Nico Robin, with Guernica staying behind to keep tabs on the raid as the other two went after her. After the two other agents lost sight of Robin, Guernica called and informed them about the great defeats produced on Kaidou's side.

Later, after Izou confronted the two field CP0 agents, Guernica once more called the remaining agent and informed him about the new orders from the Five Elders to interfere in Luffy and Kaidou's fight in order to prevent a certain awakening, acknowledging that it was essentially a suicide mission that his had partner had to take. After the remaining CP0 completed his newest mission and was seemingly crushed by Kaidou, Guernica silently mourned him.

Guernica eventually escaped from Onigashima using Geppo and regrouped with the World Government fleet that was stationed right outside Wano. He contacted the Five Elders and informed them about the return of Nika. After that, someone hijacked his call and ordered Guernica and the fleet to remain in position until the mystery caller arrived.

Guernica's contact with the Five Elders was eventually cut off due to a confrontation with the Big Mom Pirates. Guernica, however, was able to send a picture of Luffy in his awakened state to the government, which Morgans used for a new bounty poster.