The son of Vegeta and Bulma from an alternate future.
Trunks is the half-Saiyan son of Vegeta, who, in his time line, was killed by the deadly Android 17 and Android 18. He was trained how to fight by his best friend Gohan, who had also lost his father, Goku, to a viral heart disease. He was the best fighter the world had to offer when all of the other Z-Fighters were killed. It was a sad time for Earth in his time line. Everything they did was extremely covert as people had to live in fear every day of someone killing them from nowhere. Trunks and Gohan spent everyday training, as they needed to be able to move out to take care of the Androids (or hold them off, to an extent) so that people could live another day.
Trunks often times found himself wondering, was it really worth it to fight and save people who would only live on in fear of torment and pain every day, or let them die in a quick, painless second? These thoughts made Trunks wonder all of the time. Luckily, he had a high drive to fight, as Gohan had lost his father, the Z-Fighters were blatantly useless. Even with Trunks' father, Vegeta, they held no chance. All of them, Piccolo, Krillin, Yamcha, and Tien, were dead. Trunks hadn't seen them since he was a baby, and so had no memory of them, but even so he heard that they were all extremely great men from his master Gohan, who understood him above all else. His mother, Bulma Briefs, was the only other person he had grown up knowing.
Luckily, Bulma and Gohan made life all the more livable, even in these dark and dreary times.
Gohan trained Trunks in hope that one day they could fight together against the Androids, Trunks trained intensely with Gohan however in a unfortunate day Gohan was killed by Androids and Trunks had passed his natural limit and upon seeing Gohan's dead body he flew into a rage and involuntarily transformed into a Super Saiyan and continued training by himself until such time he was able to fight against the Androids however they were stronger than him he was able to hand himself against them but knowing that her son was not powerful enough to defend their city against the Androids, Bulma built a time machine to send Trunks into the past to warn the Z Fighters about the threat of the Androids and to save Goku from the heart disease however at first Trunks thought his mother was insane but later agreed to it and used her machine and went back in time and when he arrived in the past he was face to face with Frieza and King Cold, Trunks made short work of Freeza and killed him and King Cold believing it was Trunks's sword that allowed him to kill Frieza asked to see it, when King Cold asked Trunks whether or not the sword is what helped him kill Frieza, Trunks just told him to believe what he wanted and so King Cold believed that without his sword Trunks is nothing and attempted to attack him with the sword however Trunks held the sword and knocked King Cold away, knowing he would die King Cold offered Trunks to be his new son taking Freeza's place as ruler of the galaxy however Trunks refused the offer and killed King Cold.
Goku immediately arrived and began to talk to Trunks who explained everything to him and gave him the pills for his heart disease and even told him that Vegeta and Bulma are his parents from the future and in disbelief Goku began to endlessly laugh but knew it was the truth. Goku introduced Trunks to everyone however Vegeta was jealous of Trunks' power being able to transform into a Super Saiyan however Vegeta and Bulma later discover that Trunks is their son and Bulma treats him like her own child which he is and Vegeta though still acts a little cold towards Trunks also cared for him. When the Androids arrived Vegeta fought Android 18 and was severely injured in the battle and then took Trunks to train with him in the Hyperbolic Time Chamber in order to become much stronger and during their time in the Hyperbolic Time Chamber, Trunks understood why Vegeta is cold towards other people and the two of them became much closer, after reaching a new level of Super Saiyan which is an overly muscular Super Saiyan called Ascended Saiyan, Trunks went on to battle Cell who was trying to absorb Android 18 to become perfect however Trunks intervened but was stopped by Vegeta who wanted to fight Cell in his perfect form and wanted to see how strong Cell would become and so Vegeta stopped Trunks and Cell absorbed Android 18 and became perfect and more powerful than before. Vegeta fought Cell but lost horribly to which Trunks stepped in and Cell said he is intrigued by Trunks' power and the two fought however Trunks was physically stronger than Cell he lacked a lot of speed and Cell defeated Trunks with his speed and after his defeat Trunks asked why Cell didn't kill him immediately to which Cell said he would save it for his marital arts tournament.
When the Cell Games began Trunks was with the Z Fighters watching Gohan battle Cell and in order to release Gohan's power Cell spawned Cell Jr.'s who attacked him and managed to harmed him by using their speed against him. When Cell regenerated from death he attempted to shoot someone with a beam of energy however it went straight for Trunks and impaled through the chest and ultimately killing him. Upon seeing Trunks killed Vegeta flew into a rage and attacked Cell however Cell easily brushed him away however when Cell was in a Kamehameha struggle with Gohan, Vegeta got his revenge and blasted Cell in the face which distracted him long enough for Gohan to overpower Cell with his Kamehameha and kill him by incinerating his molecules.
Trunks was later revived by the Dragon Balls and he had become very close with Vegeta after learning how Vegeta lashed out at Cell when he killed Trunks, Trunks's hair had become long throughout his time in the past and Bulma from the past offered to cut it for him and Trunks accepted, Trunks then bid farewell to his friends and his parents and then returned to the future, upon returning to the future Trunks approached his mother and told her about the past and what happened while he was there and while they were talking they heard a radio say that the Androids are heading to their city, Trunks transformed into a Super Saiyan and confronted the Androids, at first the Androids underestimated Trunks however when Trunks destroyed Android 18, Android 17 took him seriously however he was easily destroyed by Trunks.
A few years past and Cell was created in the future and Trunks immediatley confronted him and told he knew about his plan to return to the past and absorb Android 18 and Android 17 and Cell was surprised as he did not reveal his secret to anyone and so Trunks fought him and easily defeated him and Trunks had made his future safe and a much better place.
Superhuman Strength - Trunks' Saiyan/Hybrid physiology grants him greater superhuman physical strength than the average Saiyan. Trunks has several notable feats of physical strength such as overpowering and overwhelming Android 17 and Android 18, effortlessly stopping a car with his leg as a child, shattering mountain-like rock formations with his fists, physically overpowering beings more powerful than a Super Saiyan and easily overwhelming Imperfect Cell with physical strength alone, he has been seen easily lifting Frieza's Supernova energy ball which is a very heavy and dense ball of energy with enough mass to destroy a planet with a single arm showing no sign of physical effort. As a Super Saiyan Trunks can lift in the excess of 40 tons as Super Saiyan Goku was able to move at lightning fast speeds with 40 tons of weight attached to his body and in his Ascended Super Saiyan and Ultra Super Saiyan form he is able to lift far in the excess of 100 tons making him one of the physically strongest Saiyans ever mentioned and seen in all of Dragon Ball Z.
Superhuman Speed - Like all Saiyans, Trunks' superhuman physiology grants him great superhuman speed. Trunks thinks, reacts and moves at superhuman speeds. Trunks has easily dodged high caliber bullets being fired by a machine gun, Trunks is able to conduct complicated plans in seconds or minutes and is able to analyze complicated puzzles and knows how to build and use advanced futuristic machinery and devices. Through intense physical training Trunks is able to further increase his speed and is functionally able to fly in the excess of the speed of sound which is roughly 770 mph however it should be noted that when Trunks trasnforms into an Ascended Super Saiyan or Ultra Super Saiyan his speed is greatly decreased and sacrificed so that he may increase his physical power. Trunks is able to dodge lightning fast attacks that cannot be seen by the human eye.
Superhuman Durability - Trunks is a a half Saiyan/half Human hybrid which grants him great durability, greater than that of regular Saiyans. Trunks' body like all Saiyans' bodies is composed of super-dense tissue and is able to withstand high caliber bullets without sustaining physical damage, as a teenager he was able to withstand blows from the Androids, Trunks is able to withstand falls from high altitudes and being smashed through hard rocky formations without sustaining any visible physical damage and he is able to survive extremely powerful energy blasts and energy waves without sustaining any visible physical damage.
Energy Manipulation - Trunks has the natural ability that all Saiyans have to manipulate energy for various purposes such as energy blasts, energy balls, energy waves, energy shields, energy bolts, explosive energy waves etc. Trunks has been shown creating colossal energy blasts that overwhelm the likes of the Androids and even Perfect Cell and was able to effortlessly incinerate Imperfect Cell with a colossal energy blast. Trunks' most powerful blast is the energy blast he performs during his Shining Sword attack and his most powerful and colossal energy blast is the blast he performs during his Heat Dome attack that easily incinerated Imperfect Cell. Trunks can also create and generate incredibly powerful and colossal energy balls such as his Burning Attack energy ball and his Buster Cannon energy ball which both can destroy the planets. Trunks can also launch a scattered array of energy bolts at his opponents and can manipulate energy to create strong energy shields to protect him from powerful attacks. Trunks commonly manipulates ki energy and can gather the ki energy from his environment and use it to enhance and or increase and or augment his power, when he begins gathering energy a flame-like aura of any color forms around his body and it begins to rapidly shift as he increases his power. Trunks can channel ki energy through his body to enhance or increase his physical power and can also concentrate ki energy into single areas of his body such as fists to deliver more powerful and harder punches and this attack is called an "Energy-Enhanced Strike".
Energy Constructs - Trunks is able to manipulate energy to create solid energy constructs that are extremely hard and can be used to deliver immensely powerful blows that unleash great concussive force.
Radar Sense - Trunks is able to sense the ki energy of other beings and follow the energy trail the ki energy of the being leaves behind and uses this ability to locate other beings or sense their presence. Trunks can also sense the remnants of energy signatures and is still able to follow the energy signature left behind by the remnants of the ki energy.
Superhuman Agility - Trunks' body is physiologically superhuman which grants him superhuman agility, bodily coordination and balance. Trunks is capable of performing complicated acrobatic movements that are almost circus-level, his agility is so great that he is able to use it to dodge lightning fast attacks.
Superhuman Stamina - Trunks' Saiyan/Human hybrid physiology makes his body superhuman and produces less fatigue poisons than any human in the universe. Trunks is able to engage in intense physical activity for weeks before his body's production of fatigue toxins in his blood begins and impales his body tiring him.
Unarmed Combat - Trunks was trained by Future Gohan who was a stern and complete warrior. Trunks is a master in certain martial arts styles and has combined his hand to hand combat experience and knowledge to create his own unique fighting style and martial arts. Trunks is also a very serious warrior and is a tactical and strategic genius.
Swordsmanship - Trunks is a master swordsman and has been able to defeat Mecha Frieza with a combination of his strength and swordsmanship skill. Trunks fights fluidly with his sword and performs great swift maneuvers. Trunks however lost the use of his sword after it was broken during an intense battle.
Flight: Trunks is naturally able to fly as it is a natural Saiyan ability. Trunks has complete mastery over his flight as he is able to hover, levitate, move swiftly and spin fluidly while maintaining balance and altitude, he is able to fight perfectly while airborne and can fly at incredible speeds. Trunks is able to fly at high atmospheric pressures and harsh and intense environments and temperatures.
Trunks first transformed into this form after witnessing his master Gohan's death at the hands of the Androids which caused his rage to surface. When Trunks transforms into a Super Saiyan his appearance changes dramatically as his eyes turn into a bright emerald green color, his hair turns golden and stands on end, becomes sraighter and spikier and longer, his skin tone becomes lighter, his facial expression sharpens, he becomes slightly more muscular and a flame-like golden aura is formed around his body. Trunks' power increases dramatically and his power increases 50x his normal power level and his speed is also greatly increased however even with the immense increase in power he still maintains his sincere and serious demeanour.
Trunks achieved this form after he and Vegeta suffered defeat at the hands of Android 17 and Android 18 the two underwent intense training in the Hyperbolic Time Chamber. In this form Trunks' power and speed are greatly elevated and his physical strength is greatly increased. Trunks' appearance changes slightly, his muscles swell causing his body to become several times his size and his muscles increase greatly and he becomes bulkier, his hair grows slightly longer and becomes spikier and sharper and his skin tone becomes slightly lighter.
This form is Trunks' most powerful form. This is another form achieved by Trunks during his training session with Vegeta in the Hyperbolic Time Chamber. In this form Trunks' muscles become abnormally large and swell even more than in his Super Saiyan 2nd Grade form, he becomes bigger in size due to immense muscle mass increase, his hair become slightly longer and spikier from his previous form and his aura becomes spikier. In this form Trunks is at his most powerful and physically strongest however this form has great lack of speed and mobility giving Trunks a great disadvantage in battle as this form requires too much time in ki and energy consumption and cannot maintain this form for long periods due to that fact. In this form Trunks may have been stronger than Perfect Cell but lost because of extreme lack of speed (though Cell displayed a similar transformation, mocking Trunks for not seeing the speed disadvantage).
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