Vinsmoke Ichiji

Vinsmoke Ichiji is a member of the eldest son of the Vinsmoke Family and the high ranking member of the Germa 66. Like his brothers Vinsmoke Niji and Vinsmoke Yonji, he was born lacking empathy and true emotions and he also bullied Sanji when they were younger. He serves as a major antagonist of the Whole Cake Island Arc.

Personality
With Vinsmoke Judge's experiments on him before birth, Ichiji was modified to have no empathy and no true emotions like his other brothers Niji and Yonji. As a result of the experiments, Ichiji became vain and abusive towards his younger brother Sanji for being weaker than the other siblings. And as adults, he continues to mock and tease Sanji for being weaker than him and continues to look down on him. Unlike his other brothers who are more unhinged and sadistic, Ichiji is colder and more impersonal than them when it comes to his relationship with Sanji.

As a royal son of the Vinsmoke Family, Ichiji sees himself as a better individual than other people especially his brother Sanji. He has no hesitation when it comes to sacrificing Germa 66 soldiers to protect himself by using them as shields. He is also arrogant and sees himself as very strong compared to other people in general. Like his father and brothers, he is prideful in the Vinsmoke Family and Germa 66 and does not mind how destructive Germa 66 have been.

Since he lacks empathy and emotional attachment, Ichiji like his brothers do not feel fear when their lives are in danger as seen by when the Big Mom Pirates attempt to assassinate them in the wedding. However, Ichiji intending on exacting revenge on the Big Mom Pirates for attempting to kill him and his family and chose to rescue Sanji from them while he escaped from them.

Past
Ichiji was born to the Vinsmoke Family in over twenty years ago. Because of his father, Vinsmoke Judge's, unethical experiments on Ichiji and his siblings (with the exception of Sanji) he was born lacking empathy and actual emotions. The experiments by Judge, however, made Ichiji into a person with superhuman strength. As Judge monitors, Ichiji's progression, he was impressed by their skills and improvements. At the same time, Ichiji would constantly bully Sanji alongside his brother for being weak. When Ichiji heard of Sanji supposed death by Judge, Ichiji and the other did not feel anything for Sanji when he supposedly died. But they later found out that Sanji escaped from the Germa 66 castle.

Whole Cake Island Arc
Ichiji and Niji appeared on Broc Coli Island where he ended a two year war in return for money for their services. They later left Broc Coli island to get to Totto Land to meet Sanji for the wedding he is meant to have with Charlotte Pudding.

Ichiji and his family had dinner together with Sanji and had their conversation until Sanji states how he is not like them. Sanji then got into a confrontation with Niji but they left from the dinner. Ichiji later met Sanji again with his other brothers after Yonji showed him the room where the clones are made. Ichiji along with Niji and Yonji attacked Sanji severely harming him and damaging his face.

Ichiji later appeared in a carriage to go Big Mom's castle. He witnessed Sanji's attack against Luffy where Sanji severely injured his captain and decided to abandon the Straw Hat crew. Ichiji along with the family met Big Mom and saw her collection of unique creatures where they felt unimpressed.

The night of the wedding, Ichiji alongside his brothers and fathers sat back and drank awaiting the wedding. They also took the time to mock Sanji as well before the wedding.

The next morning as the wedding began, the Vinsmoke Family got to the wedding venue. As the ceremony began with Pudding and Sanji, the Vinsmokes were shocked when the Priest was knocked out and then later surprised when a bunch of Luffy clones sprang out of the wedding cake to wreak havoc on the wedding. Vinsmokes were trapped by Charlotte Perospero's candy technique where they were immobilized by the candy. The Big Mom Pirates were about to assassinate the Vinsmokes. Judge was scared but the Vinsmoke brothers were not and they mocked Judge for his cowardice.

Big Mom's scream helped knock out the threat near them and they got their tool and armor from Nami, Chopper, and Carrot. They broke out of their trappings from Perospero and attacked the Big Mom Pirates near them. They later retreated into Capone Bege's Big Father form to shield them from the attacks from the Big Mom Pirates. Judge and the Vinsmoke decided to their allies for saving them from the assassination by protecting Caesar Clown from the Big Mom Pirates as they make their escape off the wedding venue. Ichiji got into a fight against Charlotte Katakuri but was defeated by him. However, the castle that the wedding took place on was destroyed and the Vinsmokes alongside the Straw Hats and the Fire Tank Pirates took that opportunity to escape from the Big Mom Pirates.

Trivia

 * Ichiji is voiced by Noriaki Sugiyama in the anime. He is the same voice actor who does the voice for Sasuke Uchiha in the Naruto anime.