Jia Xu (rōmaji: Ka Ku) is a strategist who has been highly praised for his sly wit. He has been described as a person who "shares the same intellect as Chen Ping and Zhang Liang". He first served Dong Zhuo and eventually went on to serve as Cao Pi's Grand Commandant. Though he was valued by the Cao family, it was said that Jia Xu was a suspicious individual who was never fully trusted by his masters.
Prior to his Dynasty Warriors playable appearance, Jia Xu has been a Wei NPC since its second title. His character's height in this series is 172 cm (5'8"). He is thirty-first place with fans in Gamecity's Dynasty Warriors 7 character popularity poll.
In Wei's Story Mode in Dynasty Warriors 7, he first appears as Zhang Xiu's right hand at Wan Castle. He subtly persuades Zhang Xiu to pretend surrender to the invading Cao Cao in order to lure them into a trap. The plan succeeds but Cao Cao manages to escape with Dian Wei's sacrifice. To avenge his bodyguard's death, Cao Cao invades Wan Castle with Xu Zhu's help. Again overcoming all of his traps, Jia Xu is defeated and at Cao Cao's mercy. Rather than slay him and avenge Dian Wei, Cao Cao allows Jia Xu to live on as his strategist.
He acts as one of Cao Cao's strategists thereafter and is one of the generals who help Cao Cao's escape from Chi Bi. He takes command of the army at Tong Gate. His plan is to use Cao Cao and Han Sui's friendship to weaken the morale and loyalty of Ma Chao's army. His plan fails because Han Sui notices the treachery early. When Jia Xu personally threatens Han Sui's life, however, the enemy commander finally defects to Cao Cao. With Ma Chao's morale severely weakened by the betrayal, Jia Xu adds insult to injury when he defeats Ma Chao himself. From there on, Jia Xu is not mentioned any further. He is present in a few battles after Tong Gate as an enemy in other kingdom's Story Modes.
Jia Xu's first Legendary Mode has him serve within Dong Zhuo's ranks. He protects his master from Lu Bu and Wang Yun's defection in the capital. His second Legendary Mode is another take on Wan Castle, this time from Jia Xu and Zhang Xiu's perspective. They strive to defeat Cao Cao, who has walled himself within the castle.
During the original timeline in Warriors Orochi 3, Jia Xu and his entourage invade the post at Dongkou under the assumption that the defenders were sided with Da Ji. They defeat Kanbei's party, but their mistake led to their own deaths when the serpent army overpowered them. With future Hanbei's knowledge and support, Jia Xu's party soon learn of their mistaken judgment and willingly join the coalition in an altered future.
He is ordered to ensure Da Ji's capture at Kyushu, but the attempt fails due to Achilles's strength. Later he and Motonari team up to subdue Dong Zhuo and Yuan Shao at Jiange. Though they are heavily outnumbered and stranded without ally reinforcements, the strategists' combined wit weakens the serpent army's forces with various ruses. Their efforts are enough to convince Yuan Shao to join the coalition. He also helps efforts for Dian Wei's recruitment.
To emphasize Cao Cao's eccentric trait of hiring anyone solely on their talents, Jia Xu was added into the Dynasty Warriors series. According to the producer, he was made to be the key strategist for Wei's story. His design was made to be limited so his chain and sickle would not get stuck to his clothing. Since he was involved in a plot to assassinate Cao Cao, his design included an assassin motif with a small dagger concealed behind his belt. To strive for individuality, they made it a Middle Eastern themed design. He is considered the "old man strategist" of the cast, one with sharp eyes and a rhythmic speech pattern. Jia Xu is the character who seemingly "devours other people with his words".
Sly and quick-witted, Jia Xu deems his role as a strategist to hold utmost importance to him. Loyalty, fairness, nor patriotism fit his business agenda. Experience has taught him to seek lasting results rather than try to maintain lofty ideals. He will do anything within his power to obtain them. Underhanded tactics are not above his stature; if he feels they give succor to his cause he will use them. Should he meet failure he simply hops to another creative possibility which interests him. Jia Xu approaches people with a relaxed, honest and somewhat cynical temperament. His words may have no apparent malice, but they often rouse a feeling of weary caution to those around him. In the Japanese script, Jia Xu talks with a snappy rhythm and tends to say the phrase, "Aha-haa" (あははあ), a type of amused acknowledgement.
Jia Xu isn't completely detached from his feelings as he seems. Even he is surprised by Dian Wei's demise and Cao Cao's forgiveness. Other spontaneous acts which are beyond his expectations trigger similar dumbfounded reactions from the strategist. For his Warriors Orochi appearance, he shares special conversations with Dian Wei, Motonari, Kanbei, and Ginchiyo.
Jia Xu is affiliated with the chain and sickle in this appearance. When he is equipped with it, he can perform a unique attack exclusive to him. Upon performing his Musou techniques, he will automatically use the weapon in his attacks.
EX Attack: , , , , , : Does a low swinging slash and follows up with a flaming upwards slash.
Musou - Phantom Fire (分身火旋撃): : Does a backwards crouching somersault and creates several clones of himself. He and his clones send forth their sickles to create flaming whirlwinds.
Alternate Musou - Shadow Strike (火影): R1 + : Wraps his chain around his opponent's neck to pull them off balance and bring them closer; proceeds to do a few dashing slashes once they are in range.
Jia Xu keeps the same moveset from the previous title with the following additions.
Aerial Musou - (瞬影): , : Warps into the ground and surprises nearby opponents with a swift slash that blows them back.
Awakening Musou: Slashes horizontally from left to right several times. The attack ends with a sharp strike on the ground, causing the impact to emit a sudden burst around the vicinity. During the extension of the attack, the user repeatedly does short dashes before slicing opponents twice in a crosswise manner.
When Jia Xu was young, he was compared to Zhang Liang and Chen Ping, two primary strategists of the first emperor of the Han dynasty, Liu Bang. He was recommended as "Filial and Incorrupt", a recommendation for talented people who retain filial piety and upright behaviour, and was assigned as an attendant in the imperial court. One day, after leaving the court, Jia Xu was captured by a group of Di barbarians. Despite the sudden event, he claimed that he was the maternal grandson of Duan Jiong, a powerful and feared general at that time by the people, and asked to be buried apart from the other captives, saying that his family would pay a bold price for the corpse. As such, after negotiating a promise, Jia Xu was let go, and all of the other captives were killed.
Jia Xu later rejoined the court, taking the position as Chief Commandant of Pingjin. When Dong Zhuo and his clan were exterminated, a handful of his loyalists ― Guo Si, Li Jue, and Zhang Ji all wished to return to their respective homes. However, Jia Xu recommended that they all stay together and attack Chang'an in the name of Dong Zhuo. When they all agreed, Jia Xu fled the capital with them, building an army through their travels to get to Chang'an. Li Jue succeeded and led the attack on the city. The three loyalists wished to make Jia Xu an official nobleman, but he firmly declined. So, instead, they made him the head of a department in charge of recommending people to office, where many people benefitted from him. When his mother died, however, he relinquished his position.
Later, Guo Si and Li Jue went on to fight each other for superiority, so Li Jue invited Jia Xu to become his general. He accepted, and when the emperor was released, Jia Xu came to be under a man named Duan Wei. This was only for a short time, however, as Duan Wei and his army, though respecting Jia Xu, feared that he would turn traitor against them. The uneasy Jia Xu was courteous however, and soon left them as Zhang Xiu, whom Jia Xu had connections with, sent for him.
Zhang Xiu made good with Jia Xu, who proved his useful intelligence. On one occasion, during Cao Cao's campaign against Zhang Xiu, Jia Xu disagreed with his lord's decision to personally pursue Cao Cao, sure that they would lose. They did, but, when when the lord retreated back, Jia Xu told them to pursue them once again as they would win ― which they did.
During the time of the Battle of Guandu, the major warlord Yuan Shao had sent a messenger to request an alliance from Zhang Xiu. Jia Xu told the messenger, "Return and express to Yuan Benchu that we decline. If he could not accept even his brother, could he accept the talented men of the realm?" Jia Xu referred to Yuan Shao's distrust for his half-brother, Yuan Shu. Zhang Xiu asked his advisor where they would find refuge, to which he replied they would find it with Cao Cao, as he is weak but controls the Emperor, and with his small numbers, would be glad to take them in. Yuan Shao had a very large army, so he would not regard their presence highly. Zhang Xiu thought, and led his troops to Cao Cao. When Cao Cao saw them coming, he rejoiced, and praised Jia Xu. Later in the battle, Jia Xu skillfully advised Cao Cao to many small victories.
Later, when Cao Cao was leading a campaign against Han Sui and Ma Chao, he followed all of Jia Xu's strategies which led to victory and victory.
Historical records praised Jia Xu's ability and stated that to keep away from suspicion, he avoided making friendly relationships with other prominent figures, and avoided marrying his children to other pretigious clans. Jia Xu was an important supporter to Cao Pi's rise to the throne, and the generals in Cao Cao's army would go to him for guidance out of respect.