Vinsmoke Niji

"Electric Blue" Vinsmoke Niji is the second son of the Vinsmoke Family, making him both a prince of the Germa Kingdom and a commander in its military arm, Germa 66. Niji has blue-colored hair and curly eyebrows. He has a similar build to his brother Ichiji, being slim with long legs and standing close to him in height. His hair is groomed into a very large, curved partition across the right side of his face, ending in three prominent spikes. While commanding the forces of Germa 66, he wears a blue suit and black cape bearing a blue "2", dark goggles over his eyes, gold-colored gloves, and an aqua ascot around his neck. A set of horns extend upwards from a pair of orange and red earphones he wears, and his belt bears a buckle with a prominent lightning bolt design. Outside of his Germa combat gear, Niji wears a light-colored buttoned shirt with a tie, as well as dark pants belted with a slimmer version of the belt he wears with his Germa gear.

For formal functions, he also wears a dark floor-length, single-shoulder royal cape with an upturned collar and a neck clasp. As a child, Niji wore a light shirt with the number "2" on it, as well as a pair of smaller goggles and a smaller ascot. His hair was styled in the same manner as it is in the present, although it was much shorter. Like most members of his family, Niji is proud of his royal status, looking down upon and even abusing commoners and servants; he even expresses disgust at Sanji's displays of kindness towards such individuals. Since birth, he lacks the ability to feel empathy and sympathy due to the genetic modifications done by his father. He also has no qualms about inflicting pain onto them as shown when he attacked the head chef and even sarcastically stated that he would of beat her anywhere but the face had he known Sanji cared for her.

He does not see the importance of food as Sanji does, as he refused to eat a plate of aligot for what he believes to be an unappetizing appearance, and having eaten chocolate beforehand, he would have discarded the food into the trash. Niji is outspoken and quick to anger, as he was easily provoked by Sanji's insults, and voiced his irritation at seeing that Sanji had failed to greet him and Ichiji upon their return to the Germa Kingdom. He has also exhibited petty and vindictive behaviors, as he was willing to throw a plate at an innocent young chef's face but was stopped by Sanji, causing Niji to become furious that Sanji had defied him. When Sanji ate the meal Niji had wasted from off the ground, Niji was disgusted, claiming he felt like throwing up and went to attack Sanji before being stopped by his father. While on missions, however, Niji is serious and business-minded, making sure to collect Germa 66's commissions after performing their mercenary services. Unlike his sister Reiju, who displayed an interest in the philosophical issue of whether war or fractured peace was preferable, Niji dismissed her musings by stating that the Germa is only ever concerned with who was willing and able to pay them the most money. Despite his extreme cruelty, Niji is not completely immoral as he expressed slight disdain for Big Mom's habits to keep humans trapped in a book. Niji is lecherous like his brothers, as he became lovestruck and drooled when he first saw Nami.