Omoi

Omoi is a very cautious person and likes to think things through before acting, and as a result, gets lost in his thoughts quite often. He is more level-headed than his teammate Karui, but often demonstrates a wild imagination and has a habit of exaggerating the end result of minor things (like when Karui threw a rock at him and he believed it would cause an avalanche and destroy Konohagakure) and likes to make fun of Karui's hot-headed personality with painful results. He also has respect for people who stand by their word, even if they are the enemy. He is a very intelligent ninja. In the anime, he was shown also to be very resourceful even under pressure. It has also been said by his teammate, Karui, that he is rather pessimistic when he expresses his concern for Killer B. Nevertheless, he is capable of becoming deadly serious and exhibits great conviction when the situation demands it; having expressed disgust when he saw that Akatsuki was making Sai fight his brother and stepped in to prevent that from happening. He is likewise willing to sacrifice himself to protect others and the mission, able to smugly smile at his foe in the face of impending demise just to spite them.

Omoi is a young, dark-skinned Kumo-nin with short, spiky, white hair and dark eyes accentuated with eyelashes curving upwards from the corners. He wears a dark outfit consisting of an overlong shirt with a hood, with red bandage hand guards, Kumogakure shin guards, and a black forehead protector along with a Kumogakure flak jacket. He is always seen with a thoughtful expression, as though always in deep contemplation and sucking on a lollipop. He also carries a long sword on his back. Years after the Fourth Shinobi World War, Omoi's appearance and attire is mostly unchanged, though he now wears a smaller version of his village's flak jacket, which only covers his chest. He has also stopped wearing a forehead protector in the manga, while in the anime it remains until the Kara Actuation Arc.

Omoi is a very capable shinobi, having been specifically chosen by the Fourth Raikage for certain missions, and being commended by Kakashi Hatake on his strength. By adulthood, he had become a jōnin, and would regularly be the bodyguard of the Fifth Raikage.

Trained by Killer B, Omoi is highly proficient in kenjutsu, gaining praise from Sasori in that regard. He uses a fairly long katana into his fighting style. He can easily counter a barrage of attacks with a single swipe of his blade and just as effectively attack from behind himself surprising his opponent. In the anime, he was shown even able to cross blades against a famous swordswoman like Ameyuri Ringo. He is also shown to be very clever in battle, using feint attacks and deceptions with shadow clones or the Body Replacement Technique as set ups for a final blow.

Besides physical combat, Omoi has noted that he can use Lightning Release to a certain extent, such as infuse his sword with lightning. In the anime, he is also shown able to produce a strong bolt that when guided by water will take out a fair number of enemies. He can also collaborate his lightning chakra with others to produce a powerful lightning burst.

He is very resilient, able to continue fighting after being hit by lightning attacks. Similarly, he is shown to be able to hold his breath for a noticeably long period of time while still fighting effectively. Also, despite their constant bickering, Omoi has shown to be able to collaborate effectively in battle with his teammate Karui, using fluent attack patterns without having to communicate with each other, as seen during their brief scuffle with Team Kakashi. He also has impressive strength, able to send Sakura Haruno flying a considerable distance away with a single kick. By adulthood, he could create afterimages of himself.