Light Yagami (Alternate Universe)

Origins
Light Yagami discovers a mysterious notebook on the ground at his school. Written on the cover are the words "Death Note". The Death Note's instructions state that if a human's name is written within it, that person shall die. Light is initially skeptical of the notebook's authenticity, but after experimenting with it, Light realizes that the Death Note is real.

After putting much thought into whether or not he should continue using the notebook, he ascertains that no one else will be able to bear the burden of improving the world. Light then meets the previous owner of the Death Note, a Shinigami named Ryuk. He explains his reasons for dropping the Death Note in the Human World, and when it is Light's time to die, he will be the one to write Light's name in his notebook. Light then tells him of his goal of getting rid of all the evil people in the world.

Light grew up in Japan with his family, which consists of his father, Soichiro Yagami, who is a member of the Japanese Task Force (an investigation team opposing Kira), his mother, Sachiko Yagami, and his younger sister, Sayu Yagami.

Light is a third-year high school student (12th Grade) at Daikoku Private Academy and also attends supplemental classes at Gamou Prep Academy in the beginning of the story. He later attends college at To-Oh University.

Personaility
Light did not start as a murderous vigilante - he was a sympathetic and popular, yet depressed student who was bored with his life, with real concerns about fixing the world of its various injustices, and believed that the world was "rotten" because of the evil people in it. It is upon discovering the Death Note and seeing its deadly effects, Light saw that he could use it's power to punish evil doers and make a better world in which everyone can be happy in.

Light Yagami is an extremely intelligent, calculating, collected and is driven by a strong sense of justice. Highly perceptive and good with problem solving skills, Light is a highly skilled planner and good at mapping out scenarios. He doesn't express fear while speaking with Ryuk or others Shinigamis, despite their mysterious and murderous nature, as well as their immense magical powers. Light has an immense hatred and respect for L Lawliet, the enigmatic and genius detective from the Task Force - and the only character in Death Note who's at least as intelligent and sly as Light.

Unlike his original counterpart, Light is capable of compassion and sympathy, however, only to the likes of his family and those he know he can trust like Misa, Mikami, and Takada.

Abilities

 * Genius-Level Intelligence: Light is extremely intelligent and possess an outstanding level of mental agility as well as being a brilliant strategist and tactician, outsmarting even the strongest of opponents in a battle of wits and being able to predict other people's action with a single glance. Light's intelligence is so great that he is even considered to be as intelligent as L, with L admitting his ingenuity after watching Light during his surveillance. His mind also processes information quickly, giving him an accelerated learning aptitude. He possesses an eidetic memory (he never forgets anything and has perfect instant recall), he can read at superhuman speeds, and can intuitively understand what's going to happen and how to deal with it.
 * Master Tactician & Strategist: Light is a strategic mastermind. He’s a highly skilled planner and good at mapping out scenarios. He often elaborated unbelievably complicated schemes to compensate for his lack of henchmen by involving pretty much nearly everyone around him. When Light orchestrated a bus jacking in order to find out his follower’s name by controlling a criminal with the Death Note. Also, he manipulated Ray Penber into writing names of his fellow FBI agents onto pages of the Death Note by stating that non-compliance would lead to his death, the death of his love, and the deaths of his family. However, Light’s strategic abilities is also applied to his thorough preparations. As Light arrives home, he finds the doorknob of his bedroom (which is usually lowered by a few millimeters) is strangely at the very top, plus the pencil lead placed on his door hinge is broken. Not only that, but his bluff, a piece of paper, was strangely put back in his door. This has Light believing that L has installed surveillance cameras and wiretaps within his room. When Light is about to study for his upcoming entrance exams, he has placed a snippet of the notebook and a mini-LCD TV within a potato chip bag (which contains a flavor which only he out of the rest of his family prefers). While studying, whenever Light places his hand in the potato chip bag, he actually checks for criminals' names using the mini-TV then writes down their names. The main idea is that L would see that criminals have died which Light could not have possibly see, being busy in his room, studying. With this trick, Light manages to kill two petty criminals. And when Light, was cornered by L, puts his master plan into action. Rem had already relinquished ownership of Misa's notebook to Light, wiping her memories and preventing her from confessing. Light then swaps the notebooks with their respective Shinigami, with Ryuk being attached to the notebook originally owned by Misa and Rem attached to Light's. Light places two fake rules in the notebook Rem is attached to, one being that when the notebook is destroyed, anyone who has touched the notebook will die, and, most importantly, whoever doesn't write names within the notebook within 13 consecutive days dies. Light instructs Rem to allow Kyosuke Higuchi to become the new owner of the Death Note she is attached to, then asks L to detain him. During his confinement, no criminals die, which strengthens the case for Light being Kira. Within seven days of confinement, Light gives up his ownership of his notebook, and consequently has all of his memories of being Kira wiped and altered. During his fifteenth day of confinement, criminals begin dropping dead again, and on his 50th day, the Task Force has L release Light and Misa. L and the Task Force then find the 13-day rule, successfully clearing Light and Misa of being suspected, while L is still skeptical. Light instructs Misa to find her buried Death Note, which results in her regaining her memories. Light instructs Misa to kill L if she remembers his real name from when they were on campus, but Misa doesn't remember and so makes the Shinigami Eye deal again, which is what Light wanted in case Misa forgot L's name, as taking the Eye deal and halving her lifespan would pressure Rem. Light then instructs Misa to begin killing criminals again so that L would suspect Misa is behind the killings. This is in order to put Rem in a situation where she'd be forced to kill L in order to save Misa. Rem does indeed kill L and Watari, which results in her death, just as Light planned.
 * Polymath: Light is excellent in a wide variety of academic fields. He is ingeniously skillful and knowledgeable in Biology, Technology, Mathematics, Physics, Mythology, Geography, & History. Gained degrees in Criminal Science, Forensics, Computer Science, Chemistry, and Engineering by the time he was 21.
 * Master Manipulator: He is an extremely clever and sly master manipulator. Taking advantage of Naomi's emotional state, Light gives the possibility that she could join the Task Force and help catch her fiancé's murderer. Light says that he will need to see a form of identification before she can join, and Naomi shows him her driver's license.
 * Master Actor: Light is a very skillful actor, able to effectively maintain his facade as an innocent and friendly individual in public who would never kill someone, while secretly killing dozens or hundreds of people each night.
 * Mental and Emotional Control: Light displayed excellent control over his mental and emotional conditions, like when "Hideki Ryuga" then reveals himself to Light as L. Light is shocked by this, but stayed calm around this supposed new friend he's made.
 * Multilingualism: He is extremely fluent in English, Spanish, Japanese, German, Russian, Arabic, French, Latin, Cantonese, Mandarin, and much more.
 * Master Hacker: Light can hack into almost any computer and learn what he needs from its database. He was able to hack into his father's computer without leaving a trace, and discovers that L and the Task Force speculate that Kira may well be a student.
 * Master Martial Artist: Even though Light relied more on his high intelligence, he was known to be neverthless a highly talented and capable martial artist, with a particular talent and profiency in boxing. He has clearly greatly refined his skills to the point that when they calculated brawling, he was able to easily keep up against the highly skilled L.
 * Skilled Marksman: He appeared to be proficient in using firearms as well.

Death Note

 * The Human whose name is written in this note shall die. This note will not take effect unless the writer has the subject's face in mind when writing his/her name. This is to prevent people who share the same name from being affected.
 * The Death Note will not ever affect a person whose name has been misspelled four times.
 * If a Death Note owner accidentally misspells a person's name four times, that person will be free from being killed by the Death Note. However, if the Death Note owner intentionally misspells the name four times, the owner will die.
 * When the same name is written in two or more Death Notes within 0.06 seconds, the entry is regarded as simultaneous; the Death Notes will not take effect and the individual will not die.
 * When the same name is written in two or more Death Notes, the note which was used first will take effect, regardless of the time of death.
 * The Death Note will not take effect if the victim's name is written on several different pages. However, the front and back of a page is considered to be one page. For example, the Death Note will take effect if the victim's last name is written on the front page and first name on the back.If the cause of death is written within 40 seconds of the subject's name, it will happen.
 * If the cause of death isn't specified, the victim dies of a heart attack in 40 seconds. However, the rule can be delayed for twenty-three days, meaning you can write down "dies by heart attack in [xx] days."
 * After writing the cause of death, the details of the death should be entered within the next 6 minutes and 40 seconds.
 * If the time of death is specified within 40 seconds after writing the cause of death as a heart attack, the time of death can be manipulated and can go into effect within 40 seconds after writing the name.
 * The conditions of death will not be realized unless they are physically possible for that human or could be reasonably assumed to be carried out by that human. Although it is possible to control a person's actions, if an impossible situation is written down the person will simply die of a heart attack.
 * You may write the cause and/or death prior to filling in the name of the individual. Be sure to insert the name in front of the cause of death. You have about 19 days (according to the human calendar) to fill in a name.
 * After an individual's name, time of death, and conditions of death are entered in the notebook, the time and conditions of death may be altered as many times as desired as long as they are changed within six minutes and 40 seconds from the time they are filled in. But, of course, this is only possible before the victim dies.
 * If you write "dies of accident" for the cause of death, the victim will die from a natural accident six minutes and 40 seconds after the time of entry. "Accident" is a condition of death, so six minutes and 40 seconds are provided to write down additional details. The conditions do not take effect until this time has passed.