Ichiji

Like most members of his family, Ichiji is proud of his royal status, looking down upon commoners and servants. Like his father, Niji, and Yonji, he expresses disgust at Sanji's displays of kindness towards such individuals, and labels him a "disgrace" to the family name.[14] Despite being a prince of a highly imperialistic kingdom, however, Ichiji demonstrates little care for political affairs, and said so when his family discussed the mission on Broc Coli Island.[15]

Since birth, Ichiji has lacked the ability to feel empathy and sympathy, due to the genetic modifications performed on him by his father.[16] He is cold and brutal to the people he fights, caring only about his task and not their lives. He expresses disdain for the people who oppose him, commenting that the four hours he spent fighting on Broc Coli Island had been a waste of effort. He also expects his subordinates in Germa 66 to lay down their lives for him at any point, showing no emotion at their deaths. Ichiji has also demonstrated that even the prospect of his own death is not enough to move him. After Big Mom revealed her treachery, Ichiji reacted with nonchalance, speaking only to reprimand his father's tears as pathetic.[17] Ichiji is notably more hardened than Niji and Yonji as he was more focused on the mission. When Reiju was attacked by Big Mom, Ichiji simply dismissed Reiju as weak and told Niji to focus on their task to hold back the Big Mom Pirates. When his father was struck down by Big Mom, Ichiji did not bother to rush to Judge's aid, single-mindedly focused on escorting Bege and Caesar to safety as he attacked Katakuri.

Unlike his more hot-headed younger brothers, Ichiji's usual manner is very calm and measured. However, when he is provoked, he reveals his capacity for extreme violence and brutality. During their childhood, Ichiji, Niji, and Yonji all enjoyed tormenting Sanji because of his relative physical weakness and his interest in cooking, but Ichiji appeared to enjoy it the most. His behavior during these encounters also demonstrates his aloofness, as he preferred to let Niji and Yonji do most of the attacking while he watched. However, when Sanji tried to retaliate against Ichiji during an episode of bullying, Ichiji proved to be the most vicious of the brothers, beating Sanji almost senseless and warning his younger brother to never touch him again.[5] When a despairing enemy soldier tried to shoot him during the war on Broc Coli Island, Ichiji told the man that he did not care about his dead family or his country before killing the soldier with his own gun.[1] Additionally, like his sister Reiju, Ichiji prefers to watch events unfold without interfering, forming his own opinions and speaking up primarily to have the last word in a conversation.[18][19]

Despite his ruthlessness and engineered apathy, Ichiji has a strong sense of appreciation and gratitude. When Oven attempted to kill both Sanji and his captain, Ichiji wasted no time in saving his brother by assaulting Oven as repayment for saving his life during Big Mom's Tea Party.

Like his younger brothers, Ichiji possesses a lecherous streak, as he became lovestruck when he first saw Nami.[20] However, he is able to put his amorous tendencies aside and think rationally, as he reminds his brother Yonji that marrying into the Charlotte Family would require forfeiting their freedom after Yonji stated a desire to marry Charlotte Pudding himself.Ichiji has red-colored hair and curly eyebrows. Like all the Vinsmoke siblings, his distinctive curly eyebrows form a spiral that resemble the numeral 6. He is slim with long legs and stands at a comparable height to his brother Niji, being slightly taller. His hair is fashioned into three prominent cowlicks on the right side, and also curls upwards slightly at the roots, like his sister's. His right arm bears a prominent tattoo: the number "1" in the center of a stylized circle, surrounded by flames.[9]

When commanding the forces of Germa 66, he wears a dark red raid suit, including white gauntlets, a red ascot, a white cape (bearing a red "1" on its left), as well as a pair of sunglasses.[1] Outside of his raid suit, Ichiji wears a dark shirt with an upturned collar and a light cravat, as well as a pair of light-colored pants.[10] For formal functions, he also wears a floor-length, single-shoulder royal cape with an upturned collar and a neck clasp. However, unlike his siblings, his cape is light-colored.[11]

During the Tea Party, Ichiji changed into a white frilled dress shirt, as well as dark pants and gloves. He also wore a light-colored royal cape similar to the one he was wearing previously, but shorter and clasped together with two chains. In the anime his cape is dark red.[12] After chaos broke out, he changed back into his raid suit.[13]

As a child, Ichiji did not wear glasses and he wore a red shirt with the number "1" on it, white pants, brown boots, and a dark magenta-reddish bandana around his neck. His hair was styled in the same manner as it is in the present.[5]