Okuyasu as seen in The Book: 4th Another Day
Okuyasu with his Stand The Hand
Okuyasu, fatally wounded by Killer Queen
Okuyasu Nijimura (虹村 億泰, Nijimura Okuyasu) is a central character and core ally in Diamond Is Unbreakable.
Introduced as an antagonist, Okuyasu soon becomes Josuke Higashikata's best friend. They stay close friends throughout Part IV, and presumably onwards after.
Okuyasu is a young man of above-average height and medium to athletic build.
Two fine lines cross his face, in semicircles passing the inner corners of his eyes. He wears a small pompadour, resting high on his crown; the hair at his sides light and combed back closely.
He wears a dark, modified Japanese school uniform. He wears a double-breasted jacket, which he decorates with metallic/golden emblems including a yen (¥) sign on the right of his collar and a dollar ($) sign on his left (more accurately, a cifrão; with two vertical lines); along with a larger dollar sign in the middle of his chest. On his right shoulder he has printed "億" ("Oku", the kanji for 100,000,000); variously replaced with the word "TRILLION" in large, light letters between his shoulder and elbow; mirroring the word "BILLION" on his left.
He wears two slim, sagging belts at the top of wide-legged pants.
Okuyasu describes himself as stupid. However; he is consistently friendly, loyal and cheerful. He tended to rely on his elder brother Keicho Nijimura to make difficult decisions.
After Akira Otoishi and Yoshikage Kira murder his brother Keicho and friend Shigekiyo, respectively, Okuyasu shows a desire for vengeance.
Okuyasu has been known to say that he is "not good at making decisions". He punches out Akira Otoishi through luck when presented with the choice between him masquerading as a Speedwagon Foundation employee and a real one.
Okuyasu is affected by Koichi's relationship with Yukako Yamagishi; mildly (comically) envious of his success.
Okuyasu's Stand, The Hand, "cuts" out space; replaced with redistributed neighboring space; or eradicated. It can also be limited to only physical substance removal as seen in a few occasions, functioning identical to Cream's void in this case.
Okuyasu's father has mutated into a bizarre creature due to DIO's spores when Okuyasu was only 7. Searching with his brother Keicho Nijimura for a way to kill their father and put him out of his misery, the Nijimura brothers start using the Bow and Arrow in possession of Keicho to find a user capable of killing him.
In their search for a Stand capable of killing their father, the Nijimura brothers end up shooting Koichi Hirose, giving him Echoes. This attracts Josuke Higashikata's attention and a fight ensues. Okuyasu, due to not being very bright, ends up causing his own defeat and even enters in the attack range of Bad Company. After explaining his story, Keicho is killed by the Stand Red Hot Chili Pepper, who steals the Bow and Arrow.
Okuyasu sought revenge against its user, but almost died in the battle. He eventually managed to protect Joseph Joestar from the user Akira Otoishi, being responsible for his arrest.
During this time and the following events surrounding Yoshikage Kira, he became fast friends with Josuke, Shigekiyo Yangu and Koichi.
Okuyasu recieves the benefit of Tonio Trussardi's cooking and his Stand Pearl Jam; deeply affected physically and emotionally.
He rather dislikes Rohan Kishibe because of what Rohan tried to do to him in their fight, making Okuyasu burn himself while transformed in a living book for trying to save Koichi.
Okuyasu's value of friendship is the reason he became enraged when Shigechi was killed by Yoshikage Kira. In their search for Kira the group encountered his father Yoshihiro Kira, but Okuyasu couldn't help them because he was outside of Atom Heart Father's depicted area.
Okuyasu also fought Toyohiro Kanedaichi, but was unable to hit him as a result of Super Fly reflecting his attacks.
Eventually, Okuyasu seemingly dies after suffering mortal wounds during a battle with Yoshikage Kira, only to return after meeting his brother in a dream. Keicho asks him where he wants to go, and Okuyasu answers that he wants "to go back to Morioh", which results in him waking up.
He appears at the end to say goodbye to Reimi Sugimoto, claiming that he will be lonely without her (just like Rohan).
(The information below derives from a Light Novel not written by Araki. As such, it may or may not be considered canon.)
Okuyasu helps in the investigation of Hanae Orikasa's death. He eventually comes across the killer Takuma Hasumi and chases him to the library, where they engage in battle. Okuyasu's experience and instincts turn out to be useful against the inexperienced Stand user, causing serious injuries to him, but ends up being defeated. Nonetheless, Okuyasu contributes to Josuke's victory by telling him how the killer fights.
Okuyasu makes a brief appearance, hearing Rohan's story about Nanase Kishibe along with Koichi and Josuke. Okuyasu tells Rohan he always reminded him of Mona Lisa and asked for him to imitate her pose for a photo. Rohan left to investigate Nizaemon Yamamura's painting without saying anything, making Okuyasu say he didn't mean to insult Rohan.
Okuyasu appears at the end of the story, again enjoying Tonio Trussardi's cuisine.
Okuyasu makes his game debut in the PS3 title, as a playable character. He was confirmed for the game along with Josuke, Jolyne and Ermes.
Since Okuyasu did not fight many enemies during the events of Part IV, his moveset is mostly based on his Stand ability and his own strong kicks and punches since he's a "hot headed" type of character. Okuyasu only has two special moves (one having two variations), but he can strengthen its attack. The longer he charges his attack increases its damage output and range. Using his Stand's ability, Okuyasu can both "teleport" ahead of his position or bring the opponent near him, he can also make The Hand use its ability in order to make a low attack in form of a rapid coil barrage (similar to how he tried to erase a downed Red Hot Chili Pepper).
His HHA causes The Hand to erase the immediate area in front of him, it can delayed to increase the damage and range, ultimately reaching a very wide area in front of him. His GHA has him use his Stand to repeatedly attack the opponent with his power, then after a final hit, he grins before a random flowerpot flies out of nowhere and hits him right in the face (referencing how Josuke "defeated" him in his introduction chapters), dealing a small sliver of self-damage (making Okuyasu the only character who can damage himself with his GHA in the game).
Okuyasu possesses a single alternate costume, based on a moment during the events of the Pearl Jam chapters, where he took his school jacket off, revealing a tank top underneath. Aside from being a playable character, Okuyasu also appears on the "Kira Estate" stage as a background character along with Koichi, unless of course he is one of the two fighters being played.
Okuyasu was confirmed for JoJo's Bizarre Adventure: Eyes of Heaven alongside Rohan, "Kosaku Kawajiri", and Part IV Jotaro. He forms a special tag team with Josuke.
Since most of the game's animation, effects and attacks were reused from All-Star Battle, Okuyasu's moveset remains the same; Utilizing The Hand to close the distance between him and his targets, and being a close-ranged combat character otherwise.
With Josuke, they both can perform a unique DHA where Okuyasu has The Hand bring their opponent closer by eliminating a wide space in front of them, leaving them staggered. Both Okuyasu and Josuke interject before The Hand and Crazy Diamond pummel their target before a joint uppercut that sends them high into the air, with the two of them yelling in unison.
Okuyasu as seen in The Book: 4th Another Day
Okuyasu with his Stand The Hand
Okuyasu, fatally wounded by Killer Queen
Key art of Okuyasu for the Diamond Is Unbreakable anime.
Okuyasu as he appears in All-Star Battle
Okuyasu Costume A in All-Star Battle
All-Star Battle concept art
Okuyasu from Eyes of Heaven
Okuyasu as a figure