Shūkurō Tsukishima is the former leader of the Xcution but he is actually Ginjo's Right-hand man.
Tsukishima's past is still mystery, nobody has any idea why he became like the way he is. What did happen in the past is that Tsukishima gathered people who could use Fullbring but also wished to get rid of those powers. The group of people became known as Xcution. Tsukishima later contacted Shinigami Representative, to pass everybody's power to Shinigami. Everything was going well until at the very last moment, Tsukishima kills the Shinigami with his Fullbring, as well as others in the groups who no longer had powers. Kugo Ginjo became the leader of Xcution since the incident, but Tsukishima still intend to interfere with Xcution.
The character of Shukuro Tsukishima is an antagonist character of the BLEACH series that was created by Tite Kubo, It first began serialization Weekly Shonen Jump in August 2001. He was later introduced during the Lost Shinigami Substitute Arc story arc.
His first appeared in BLEACH Volume 49, CH. 429 "Welcome to our EXECUTION", and his first anime appearance was in BLEACH - Episode * "??". His character in the Japanese series is voiced by Daisuke Ono, and the U.S. dub produced by VIZ Media has yet to announce a voice actor.
When Uryu was checking on Ichigo from outside, he noticed Tsukishima. Uryu chased after him but Tsukishima attacked him even before he could react, leaving great injury on Uryu. Tsukishima then goes after Orihime; Tuskishima stabs her with his Fullbring, Book of the End but there is no wound on Orihime. It is unclear what kind of damage it had done on Orihime
During Ichigo's training with Jackie Tristan, Tsukishima interrupts by barging in to Xcution's base. Tsukishima attacks Ichigo but Ichigo manages to defend himself with newfound ability. Kugo steps in to stop Ichigo from fighting any further, to help him Yukio also steps in and use his Fullbring to prevent Ichigo from fighting. During the fight Riruka steps in with her love gun were we find out Tusihima actually invented the device. Afterwards Yukio and Ginjou leave with Ichigo.
As Yukio and everyone leaves, Tsukishima attacks Sado, piercing him but leaving no mark.
When Ichigo gets home one day he hears Yuzu tell him a old friend was home here he meet Tsukishima again ho is comfortably laying on the couch. Tuskishima greets Ichigo telling him how long it has been since they last spoken to each other.Karin and Yuzu explain to Ichigo how Tsukishima got there and Tsukishima apologizes for having annoyed them. Ichigo grabs him by the collar, demanding an explanation for why he is there. Karin and Yuzu try to get Ichigo off of him, but the doorbell rings and Tsukishima asks Yuzu to get it, saying it must be Keigo and the others. Tatsuki begins to lecture Ichigo on staying out so late, and Tsukishima tells Ichigo he called everyone, and says he should call Sado and Orihime as well. Tsuksihima gets on the phone to cal them when Ichigo attacks him upfront injuring him. Tatsuki berates Ichigo for attacking his relative. Ichigo then flees. Tsukishima runs after him.
Yukio takes Ginjou and Ichigo to see Tsuksihima there is were the final battle takes place. The mansion. Ichigo at first is stopped by Ginjou from attacking Tsukishima but as the situation climaxes he is eventually allowed to fight Tsukihma with his new fullbring powers. Ginjou destroys the stairs stopping Tsukishima from getting anywhere else. Tsukishima gets his hand cut off by Ichigo thanks to this but it is quickly healed by Orihime. Tsukishima compliments her own her abilities. Tsukishima and Ichigo's battle continues and Tsukishima berates Ichigo constantly. Ichigo, however, gains a small advantage against him and surprises him when he unleashes a Getsuga Tensho; however, Tsukishima manages to redirect it. Tsukishima in his thought said that even in Fullbring, he can still use Getsuga Tenshō and that his attack speed is much greater than he anticipated, and as expected, even despair helped him to complete his power.
After this Ginjou is reveled to be working with Tsukishima in a partnership to destroy Ichigo and take his fullbring. Uryuu then arrives reveling that he is still with him. Sadly though Ginjou and Tsukishima manage to do damage to Uryuu as well. Tsukishima said he only cut Kūgo because he was bad at acting and states that Kūgo started calling Ichigo "Kurosaki" again after he cut him again. Then after Kūgo takes Ichigo's Fullbring, the pair begins to wall off and Ichigo starts to cry. Tsukishima turns around and says that he feels bad because Ichigo is crying to which Kūgo tells him to let Ichigo cry as he is no longer useful to them and will be unlikely that they will ever meet him again. Once they start walking away, a burst of energy erupts behind them, forcing Kūgo and Tsukishima to look behind surprising them as they see Ichigo in his Shinigami uniform.
As the shingami some in Tsukishima tries to mess with Orihime and Chad who has there minds tampered with. Ginjou tells him to stop before he breaks them. Kisuke and Isshin knock Hime and Chad out and take them from the battlefield. The true battle can then begin.
Tsukishima asked byakuya why he likes staring at the moon. Byakuya tells him he was thinking of how lucky Tsuksihima was to be fighting him. Tsuksihima then prepares to fight Byakuya Kuchicki as he slashes at him Byakuya uses his senbonsakura to block.Byakuya says that he thinks of his ability as cowardly. Byakuya says he will defeat Tsuksihima before his blade can reach him.
Book of the End : Manifesting form his bookmark, Tsukishima forms a katana. According to Kugo, it ability is to cut through anything. This is soon found out to be false information. Tsuskishima actually can insert himself into people's past. If Tsukishima cuts a person twice they go back to normal. When he uses his power the person cut does not get injured. Also if the victim begins to realize inconsistencies with Tsukishima's presence in their past, and what has actually happened, they begin to suffer mental damage.