Goku Black

"I'm from a much higher place than you… and I've seen the truth of this world, the Multiverse, and all things in it. I noticed the results and decided mortals must be destroyed. Mortals are the one and only failed creation of the gods. In order to make the world — the Multiverse — a beautiful paradise, I want to annihilate the mortals on the gods' behalf, who won't admit their failure!"

- Black to Future Trunks

Goku Black (Zamasu), usually referred to as Black, is the main antagonist of the "Future" Trunks Saga. His true identity is Future Zamasu (Zamasu) from the Future Trunks's timeline within Universe 10. He is a former North Kai and Supreme Kai apprentice serving his former master Gowasu.

Appearance
His original appearance is the same as his counterpart, being an above-average height Kai of slim built and green skin, and with a white Mohawk. After Goku Black is switched bodies with Goku, the Saiyan body underwent some physical changes. While Goku Black is still essentially identical, he has a slightly darker skin tone and more "defined" eyes, along with a somewhat skinnier physique. His hair is also a noticeably dark shade of black with only four front spikes and three back ones. While initially wearing his Supreme Kai attire, he soon wears a dark grey vest, a long-sleeved black undershirt with a turtleneck, a red sash, black pants and pointy white boots. He also gave the right Potara Earring to his future counterpart while still wearing the other earring on his left ear. He also wears a Time Ring on his right index finger.

Since he has Future Goku's body, he also suffered the Heart Virus. Although he does not be affected because he is a god, Black sometimes feels pain.

Personality
Zamasu is ruthless individual, killing Future Bulma and Mai without hesitation. Unlike Son Goku, his look-alike, Black had no regard for mortals and believed that the genocide he brings them is a mercy. Additionally, Black saw the mortal as evildoers and "gods' only failure", considered his extermination of them "justice" and aspired to make a more perfect world. Black also obsesses with absolute justice.

Black shows excitement at facing stronger opponents, enjoy the pain he endures in battle. Showing he'd truly inherited Gokū's love of a challenge. Despite his ruthlessness, Black did display some manner of formality, as he addressed Beerus as "Lord Beerus", a polite honorific. He also formally greeted Goku when they first meet, and refered to fighting him as an "honor".

Black has also shown a fixation on "beauty", considering the utter removal of humans as making the Multiverse into a beautiful paradise. Furthermore, he sees his Super Saiyan Rosé form as the height of beauty, valuing the form for both its power and its illustrious appearance.

Background
Goku Black existed in Future Trunks' timeline, he was once a Supreme Kai apprentice training under the Supreme Kai, Future Gowasu. When Zamasu initially meets Alternate Zamasu, he is switched bodies with Future Goku. Alternate Zamasu then explain about his plan, collecting the Super Dragon Balls to switch bodies Future Zamasu with the Son Goku, thus merging his concept with the Saiyan body. Upon having Goku's body, he killed his teacher Gowasu, and then other Supreme Kais throughout the universes, to subsequently eliminate all God of Destructions.

Zero Mortal Plan Saga
Black appeared in the destroyed Western Capital, having developed the ability to sense Trunks' ki. He attacks the young half-Saiyan and his mother, killing the older woman and destroying her lab in the process, while Trunks barely makes an escape. Keen on pursuing Trunks, Black engages him in battle at the remnants of Capsule Corporation, and attacks Mai, gravely injuring the woman. Descending from the smoke, Black revealed his form to be identical to the hero, Son Goku, and tells Trunks that the day for him to die has finally arrived.

Black taunts Trunks, goading him into attacking, which turned out to be a successful tactic. The young half-Saiyan transformed into his Super Saiyan 2 state and rushed Black, managing to land an impressive blow in the process. Black counterattacks and quickly overwhelms Trunks. Finally, Black prepares a energy attack to finish Trunks off, but the young Saiyan used his sword at the last minute to prematurely detonate Black's blast. He then launched a Masenko at Black, blinding the villain long enough to escape. Black attempts to hunt Trunks by sensing his ki and catches the young Saiyan just as he is about to escape in his Time Machine. He launched a Black Kamehameha, but the Time Machine activated at the last minute, causing him to miss. Confused, Black attempted to locate Trunks again, only to notice that his ki had completely vanished.

After attempting to locate Trunks across the universe, Black's Time Ring reacted and opened a portal to another timeline. Upon arrival, Black appeared confused as to where he was, but immediately recognized Trunks and Goku. He went on to recognize both Vegeta and Beerus. Trunks attempted to ward Black off, and Black declared his intentions to kill the Saiyan youth, however Goku intervened and flied up to fight him.

Black said that would be an "honor"—fighting Goku in "this body," much to Goku's curiosity. The two began trading blows for a little while before Goku transforming into a Super Saiyan 2. Likewise, Black rose his ki, and asked the Saiyan to show him more of his power. The fight, however, recommenced as Goku became more serious and Black took a beating. When Black's Time Ring began to act up, he realized that the distortion in space-time caused by the time travel is beginning to mend itself. Finally, he was forced back to the future, but not before noticing the Time Machine and blowing it up.

In the future, he marveled at his increase in strength thanks to fighting with Goku and was further elated that Trunks was unable to return to the future—harping that there was no one left to stop him from eradicating humanity. Black later made careful adjustments to his movements and combat stance. After he returned to the future, Black once against laid siege to the Earthlings. Despite this, he cut his assault short after only killing a small number of the remaining Earthlings.

While overlooking the destroyed Western Capital and enjoying the human-free view, Black saw a vibrant flash of ki, he headed towards the source in a funnel of cloud, and was surprised to see Trunks and co.. He was then challenged by Vegeta, who transformed into a Super Saiyan Blue, much to his compliment. Vegeta unleashed the full force of his Super Saiyan Blue power on Black. Impressed, however, by Vegeta's strength, Black resolved to show him something as a reward, and transformed into a new state which he christened Super Saiyan, after Goku and Vegeta's style of naming their form "Super Saiyan Blue". He explained to Goku that he had now completely mastered the Saiyan's power, and achieved the pinnacle of beauty as a result, though Goku did not understand. Despite Vegeta's insistence to fight him, Black no longer wanted anything to do with Vegeta, viewing him as only the opening act and said to the Saiyan prince that his turn was over. With that, the prince rushed Black, who stabbed him through the chest with a pink ki blade, fatally wounding Vegeta; also corrected Vegeta's such a a tasty appetizer and thanked him that he has now grown even stronger.

Goku stepped up, transformed into a Super Saiyan Blue, and their second battle began. Despite seeming evenly matched, Black had the advantage, and managed to knock Goku into the ground, forming a Kamehameha to finish him off. However, Zamasu descended from the sky, ordering Black to stop, as Black agreed that Zamasu would be the one to finish off Son Goku. Despite their agreement, Black butted into Goku and Zamasu's battle, attacking from Goku's blind-spot. Zamasu argued that Son Goku was supposed to be his prey, and Black told Zamasu that "this body wants Goku," and he was unable to repress that strong desire. The two agreed to work together, claiming the kill of Goku for both of them; tag-teaming Goku, the two forced him into a helpless position. Black pursued a follow-up attack but is blocked by Trunks. The enraged Saiyan-half furiously attacked Black, sending the man into the nearest building.

Black emerged furiously from the rubble, and he and Zamasu respectively released two Kikōha towards Gokū and Trunks, forcing the two into the air to dodge. Black and Zamasu managed to separate their opponents, and Gokū and Black had a brief exchange, with the latter taking Gokū by surprise with his use of the Teleportation, blasting him into the rubble. When Trunks stabbed Zamasu, Black intercepted by irritably blasting Trunks' sword away, and proceeded to attack him, only to be blindsided by Gokū. As Trunks and Gokū gathered in one place after Trunks' failed attempt to kill Zamasu, Black began to charge a Kamehameha again, and Gokū urged Trunks to run. Zamasu, however, kept the duo in place, allowing Black to release his technique uninhibited.

With Goku and Trunks critically weakened, Black and Zamasu form a large sphere with which to kill both Saiyans. However, their blast was ruptured when a Super Saiyan Blue Vegeta used his Final Flash to destroy it before collapsing once more. In the smoke, Trunks and Gokū was rescued, leaving Black and Zamasu to dispatch the weakened Vegeta. However, Mai's soldiers released a tear gas grenade, blinding Black and Zamasu and taking Vegeta away. Black tried to sense their ki, but the other humans' ki gets in the way. When Trunks' Time Machine appeared in the sky, Black could do and immediately teleported to them with Instantaneous Movement. However, they managed to escape, leaving Black angry. Zamasu insisted his partner not worry, as they will come back, and when they do, they will arrive in their Utopia.

Back at their cabin in the woods, Gokū Black and Zamasu discussed their plans. Black was lamenting that he was unable to finish off Son Gokū, but Zamasu suggested that Black took his time killing Gokū, so he could absorb more of the latter's power. Zamasu berated his partner for not using the Super Dragon Balls to gain immortality like him, but Black, transforming into Super Saiyan Rosé, replies that he's happy with his supreme battle power. He stated that his infinitely rising battle power is key to their plan, the Zero Humans Plan; Zamasu merely noted on the irony of a human's power being key to the plan to erase all humans.

Sometimes alter, at their cabin, while Zamasu was pouring tea, both Black and Zamasu sensed the return of the Saiyans, and went to confront them. Black was pleased that their arrival meaned he can become stronger; Vegeta immediately transformed into a Super Saiyan Blue, rushing in to fight Black, who responded by transforming into a Super Saiyan Rosé. The two clashed briefly, and Black insinuated that Vegeta wants to defeat him to make up for his failing in their last encounter; Vegeta, however, told Black to be quiet, as his purpose to defeat Black is only for the sake of his son, and the future, which Black commented that's a very un-Saiyan sentiment.

Goku told Black and Zamasu that they also acknowledged what Zamasu did with the Super Dragon Balls — used them to grant Zamasu immortality and created a fake of Son Gokū. Black claimed that he, however, is not a fake Goku — has the real Goku's own body, but with Zamasu's mind inside and explained that his wish to the Super Dragon Balls was that he, Zamasu, who was switched bodies with Son Goku, shocking everyone.

While Goku counterattacked, Zamasu's immortal body immediately recovered from the damage; Alternate Zamasu then revealed that in order to bring his idea of justice to fruition he needed someone who shared his ideals, himself, and told them how they teamed up and made "Goku Black", destroyed the Super Dragon Balls and killed the gods in all universes.

The fight continued, but Goku's group was still outmatched. The present Zamasu cornered Goku, told him what happened to his wife, shockingly immobilizing the Saiyan as Black approached and stabbed him in the chest through his alternate self's immortal body. That story naturally made Goku furious, and his rage gave him the strength to overwhelm both Zamasu at the same time for a while. However, Black soon counterattacked and defeated Goku with his newly improved version of his ki blade technique, and noted that due to the Saiyan body, the newfound challenge gave him a boost up in his power. As Trunks showed disgust with Black's actions, the two Zamasu claimed that Trunks is guilty of a greater sin — changing the past, violating the gods' taboo against time travel as the Time Ring is proof of his guilt; and that they would cleanse the world of his sin by eliminating him and all Earthlings. The talk, however, enraged the half-Saiyan as he admitted the sin and furiously powered up into a strange Super Saiyan form.

Trunks' rage has increased his power greatly. Using this power, Trunks is able to hold off Black. However, Black still has the upper hand in the battle. Trunks' advantage is nullified when Zamasu starts working together with Black and they overwhelm him. Black and Zamasu fire a combined ki blast, but Trunks is able to destroy the ki blast. Vegeta attempts to help only to be knocked down by the two Zamasu. Seeing that the battle isn't in their favor, Trunks launches a barrage of ki blasts onto Black and Zamasu in order to hold them off. Trunks asks Vegeta to use the Time Machine to go back into the past. Mai is given the bag of Senzu and vows to protect Trunks. Bulma, Vegeta and Goku get into the Time Machine and begin traveling back to the past. Black attempts to destroy the Time Machine but Trunks blocks him off which allows the Time Machine to successfully go back to the past. Black and Zamasu are not concerned with their escape as they will return. The enraged Trunks prepares to fight Black and Zamasu.

The battle concluded in Black and Zamasu's favour, but Trunks escaped them yet again. Black and Zamasu returned to their hideout, drinking tea. Excited at the success of the Zero Mortal Plan, Goku Black misses Mai's presence, and is nearly shot off the table with a special bullet. He immediately recognizes the attack for what it is, so he and Zamasu retaliate with a "Warning" that would heve killed Mai and her cohorts had Trunks not intervened.

Sensing Trunks, Black jokes that Trunks might be immortal as well. Trunks' engages the two in battle, and Black transforms into a Super Saiyan Rosé to meet the Saiayan-half, Zamasu following him. Black bats away the sword Trunks threw as a decoy, but is hit by a solid combo from Trunks, and sent careening away by a Garlic Cannon. Black wasn't killed by this, however, and stabs Trunks from behind, stopping the latter's attempt to kill himself and Zamasu. He does, however, compliment Trunks' effort. The Time Machine returns, carrying Goku, Vegeta and, Bulma leading to Black's glee.

He and Zamasu go confront Goku and Vegeta, and his first action is to destroy the Time Machine, making it impossible for Goku and Vegeta to return home. Black notes that Goku and Vegeta are ignoring Zamasu's monologue, but the latter doesn't care; he's talking for the sake of hearing himself. Black finds this very god-like. The groups of two prepare to fight, until Gowasu and Shin arrives to intervene.

Gowasu attempts to interrogate Black, and asks him why he would do such a thing. Black firmly believes that with the humans dead, true beauty will return to the world. He killed the gods due to the fact that they would try to intervene in his plans. Casually, he attempts to kill Gowasu for the third time, with he and Zamasu stating there need only be one god. Gokūu and Vegeta save Gowasu, however, and the latter implores Black to use the Dragon Balls of the future to resurrect those he's killed. Black simply tells him that he has destroyed the Dragon Balls, which is more than Gowasu wanted to hear.

The battle resumes, Black being challenged by Vegeta. In spite of his previous superiority, Black is being overwhelmed by Vegeta's strength, and is impressed by how quickly he's improved, commending the Saiyans for being a warrior race. Zamasu intervenes in an attempt to help, but Vegeta recovers from the sneak attack to resume fighting Black. Despite Black's attempts to land a solid blow, Vegeta retaliates and keeps Black on the defensive. Vegeta outright insults Black for stealing Goku's body, stating that the only one who can use that body correct, and its Saiyan cells, is Goku. Black cannot comprehend how he's losing, but Vegeta gives him answer; Black is a fake Saiyan, but Vegeta is the Saiyan prince.