Due to his actions and role, he is a supporting antagonist during the Wano Country Arc.
Fukurokuju is a tall man with an elongated bald head. He has a very long and pointed dark beard, and his earlobes are extremely long. His left arm is tattooed, with a pair of thick zigzagging stripes as well as five ninja star-like shapes. He wears a pair of square-shaped sunglasses and a purple kimono with a pattern of yellow rimmed, green circles with three white dots in them, as well the Japanese character 忍 (nin?) on his orange obi. 
Despite the samurai code of loyalty stipulating that a warrior must remain loyal to their master as long as they (the warrior) live, Fukurokuju sees no point in serving a dead master and believes his duty as a ninja is to serve the current shogun, regardless of how that shogun came into power. This led him to serve Orochi without issue after the latter seized the shogunate from the Kozuki Family, and he questioned Raizo and the Nine Red Scabbards' devotion to Kozuki Oden even after Oden's death, saying they are following a "ghost". He was even willing to pledge himself and the rest of the Oniwabanshu to Kaidou, a pirate, after Kaidou had seemingly killed Orochi, though he would later return to Orochi's service after the two of them reunited and began fighting Kaidou's Beasts Pirates on Orochi's behalf; Fukurokuju's exact intentions and actions are unclear at the moment.
Fukurokuju has disdain for showing emotion and believes that being emotional will prevent one from ever being an effective shinobi, regardless of their skill in ninjutsu. While vigilant in enforcing Orochi's objectives and protecting the shogun, he was patient enough to give Nico Robin one chance to explain herself when she was caught snooping around Orochi Castle. He has shown to be sadistic as he eagerly awaited Oden's death in his painful execution, and mocked Shinobu for putting her hopes on Oden.
Abilities and Powers
- Further information: Ninjutsu
Fukurokuju has been noted to be an extremely skilled master of ninjutsu by Shinobu, a veteran kunoichi. He is stated to be the biggest rival of Raizo, a ninja once affiliated with the Oniwabanshu who has been reputed as a genius since his youth.
Fukurokuju is quite adept at physical combat, unusually using his earlobes like whips as his signature method of fighting. He also possesses enough mental clarity to see through Raizo's "clone" technique and strike the ninja's real body.
- Ninpo: Mimitabu Cracker (忍法 耳たぶクラッカー Ninpō: Mimitabu Kurakkā?, literally meaning "Earlobe Cracker"): Fukurokuju's signature method of fighting, He controls his earlobes as though they were his arms and uses them to strike opponents with tremendous force like whips, with the earlobes having a considerable amount of range due to their length. He can also achieve a form of flight by spinning the ends his earlobes rapidly like rotors. In the VIZ translation, this is called Ninpo: Earlobe Crackers.
Fukurokuju was shown carrying a sword 20 years ago.
Twenty years ago, Fukurokuju and yakuza leader Hyogoro were allied with the Kozuki Family, but when the Beasts Pirates invaded Wano Country and Kurozumi Orochi took over the country, Fukurokuju betrayed the Kozuki Family and pledged to serve Orochi. His subordinate at the time, Shinobu, was disgusted with this and left the Oniwabanshu.
Fukurokuju later accompanied Orochi to Kuri. He was also present in the Flower Capital to witness Kozuki Oden's execution. After Shinobu revealed to the public what Oden did for the citizens during the past five years, Fukurokuju confronted her for her actions. However, she managed to flee as Oden met his end.
Four Emperors Saga
Wano Country Arc
The Orochi Oniwabanshu caught Nico Robin snooping in a secret room in Orochi Castle, and Fukurokuju came into the room and gave her one chance to explain herself. After Robin claimed to be Ushimitsu Kozo, Fukurokuju ordered his ninjas to capture her. However, the Robin they attacked was a duplicate created by her Devil Fruit powers. Fukurokuju then ordered his squad to find her.
As supporters of the Kozuki Family were detained in the Rasetsu District Prison, Fukurokuju told the prisoners to remain silent after telling them that their plan failed. He later went to the palace to report to Orochi about the capture of Shimotsuki Yasuie.
After the Straw Hat Pirates began causing chaos at Rasetsu Town following Yasuie's execution, the Orochi Oniwabanshu entered the battle. Fukurokuju recognized Zoro from a wanted poster and ordered his group to capture at least one of the Straw Hats.
Later, Fukurokuju informed Orochi of the Straw Hats' escape and the capture of Trafalgar Law. Fukurokuju also informed the shogun that the Flower Capital was on lockdown with the Orochi Oniwabanshu and the Mimawarigumi on guard. He reassured that he would not let anything harm Orochi until they captured their enemies.
On the day of the Fire Festival, Fukurokuju accompanied Orochi to Onigashima. After Kanjuro informed Orochi that the plot to stop the Kozuki rebellion failed, Fukurokuju reported that no rebel ships nor any suspicious samurai were seen, but Luffy, Zoro, Kid, and Killer were spotted on the island. Fukurokuju later stood at the Performance Stage along with Orochi, Kaidou, and the All-Stars as Kaidou announced the New Onigashima Project. Fukurokuju watched in complete horror and shock when Kaidou betrayed and decapitated Orochi while explaining his plans in detail.
When given the choice to join the Beasts Pirates or die, Fukurokuju quickly pledged his loyalty to Kaidou. However, when the Ninja-Pirate-Mink-Samurai Alliance went on the attack and faced the Oniwabanshu, Fukurokuju slipped away unnoticed except by Hotei. He proceeded to rejoin Orochi, who had somehow survived Kaidou's decapitation, and attacked members of the Beasts Pirates as the shogun began setting the castle on fire to take revenge.
Fukurokuju and Orochi later ran into the Scabbards, and the shogun tried to take down the samurai himself by transforming into the Yamata no Orochi. However, Fukurokuju witnessed the Scabbards decapitate all of Orochi's heads with a quick combined attack, and would later confront his rival Raizo while the other Scabbards continued moving on. Raizo questioned why Fukurokuju would serve a man as wretched as Orochi, but Fukurokuju responded that it was his duty to serve the shogun and that Raizo and his comrades were serving nothing more than a ghost. Raizo used Bunshin no Jutsu to create multiple images of himself at once, but Fukurokuju was able to spot his real body and attack it with his earlobes. Fukurokuju then criticized Raizo's emotions for getting in the way of his effectiveness as a ninja, but Raizo objected to this viewpoint.
- Fukurokuju is the name of one of the Seven Lucky Gods in Japanese mythology. Aside from his sunglasses, he also bears a similar appearance to the god, especially his elongated head.
- Fukurokuju's favorite food is daifuku.