Eobard Thawne (Earth-1: Pre-Crisis)

"This ability to travel through time revealed the truth. My fate was to become your greatest enemy. I was never going to be the Flash. So I became the reverse of everything that you were. The more people you saved, the more you were loved...the more I had to take from you."

- Eobard Thawne to Barry Allen

Professor Eobard Thawne is a Meta-Human time criminal from the twenty-second century who operates under the alias of the Reverse-Flash.

Early Life
Eobard Thawne was born around 2151 into an affluent family of influential politicians, scientists and captains of industry, with him eventually becoming one off the most distinguished members as the forename, Eobard, would apparently suggest. When he was young, Eobard attended a grade school where he was taught astro-navigation.

Eobard later began to investigate his family history where he eventually found out about Eddie Thawne despite history having almost no record of his existence and he considered his ancestor to be a failure because of this.

In his adulthood, Eobard became a scientist and professor, who began to study the Speed Force in an attempt to unlock it's secrets. He also designed an Anti-Speedster Rifle at some point.

He spent years persuing the secrets of the Speed Force before eventually learning of The Flash who he began to idolise to the point where he was obsessed and wanted to be The Flash himself. After many more years of research, Eobard learned how The Flash gained his superpowers and built a machine to recreate the accident that gave him said powers which resulted in him becoming a speedster just like his idol. He then learned how to use his powers to travel through time which he used to go back to an unknown point in the 21st century where he eventually learned that he was destined to become The Flash's arch-enemy under the alias of the "Reverse-Flash". He also either created or obtained the Reverse-Flash Suit which had the opposite colours to The Flash Suit.

This made him despise his former idol and he decided to make it his life's work to prove that he is the superior speedster, which only succeeded in fulfilling his destiny while he descended futher into insanity. He also vowed that he would kill more people than The Flash had saved and that he would take more people from The Flash than those who he was loved by.

Eobard later created the Negative Speed Force in an attempt to be the exact opposite of The Flash in every way and also so he could time travel undetected. He also at some point obtained an artificial intelligence program called Gideon which was created by The Flash. He then began searching the timeline for eras when The Flash was active, eventually travelling back to the year of The Flash's origin which started their war across time.

Travelling to the Past
In 2000, Eobard Thawne travelled back in time and fought The Flash in the Allen House which resulted in him murdering Nora Allen.

He later used an Appearance-Stealing Cord to steal the identity of Harrison Wells which killed him in the process, only for him to be ressurected some time later.

Life as Harrison Wells
As Harrison Wells, Eobard began to construct the S.T.A.R. Labs Particle Accelerator which would eventually give The Flash his powers.

Eobard also formed a close bond with Hartley Rathaway, eventually becoming his mentor and was responsible, along with Caitlin Snow, for Grodd's testings, with the pair becoming quite fond of him and often visiting him in his cage.

At some point, Eobard began to train Barry Allen and work alongside Team Flash, during which time he taught Barry to throw lightning.

In 2014, Eobard's true identity was revealed to Team Flash who fought and defeated him. However, his identity was never revealed to the public and so as a result, Harrison Wells was thought to be the murderer of Nora Allen.

It is currently unknown what happened to this version of Eobard due to his consciousness from before the crisis being preserved inside Nash Well's Mind.

Possessing Nash Wells
When Earth-Prime was created, Eobard's consiousness was transferred into Nash Wells due to him being the last surviving Wells and Eobard's DNA and appearance matching the other Wells doppelgängers, which he saw as an opportunity to regain a physical body. Due to his preservation in the Negative Speed Force, Eobard likely retains his pre-crisis memories.

When the other Wells' relealised that Eobard was with them, they restrained him deep within Nash's subconscious while Harry and Sherloque Wells attempted to get Nash to face his guilt for his part in the crisis and to seek help from Team Flash, with Sherloque eventually imitating Thawne's red eyes as a last resort. However, despite their best efforts, Thawne managed to escape and trapped Nash within his own mind through the use of his memory of losing Maya before he could tell Team Flash.

Once in control of Nash's body, Eobard attempted to murder Cisco Ramon before realising that he no longer had his powers. The two fought for a while before Eobard was incapacitated by Cecile Horton, at which point he was locked up in the Pipeline. Barry then interrogated Eobard where he revealed that his goal was to kill him and all of his loved ones, before taunting him over the death of the Speed Force.

Hours later, Eobard began to impersonate Nash and managed to trick Team Flash into activating Nash's gauntlet which generated a pulse of energy that allowed him to escape. He tried to use a Time Sphere before being interrupted by Barry, who he attempted to trick into using his last remaining speed to kill him. He almost succeeded before they were interrupted by Cisco who used a tranquilizer to subdue him.

Nash ultimately managed to overcome the memory of Maya dying with the help of Barry and Cisco after Cecile put them into his mind. Eobard was then expelled from Nash's body which left him alive as negative tachyons.

Powers

 * Possession: After the crisis, Eobard was left alive as negative tachyons which allowed him to possess humans and eventually connect with the Negative Speed Force once the host was fully overwhelmed by him.
 * Retrocognition: Eobard presumably retains his pre-crisis memories due to being preserved in the Negative Speed Force which is immune to all timeline changes.
 * Speed Force/Negative Speed Force Connection/Meta-Human Physiology:
 * Accelerated Healing Factor:
 * Enhanced Longevity:
 * Bodily Vibration:
 * Intangibility:
 * Electrokinesis:
 * Superhuman Durability:
 * Superhuman Mental Processes:
 * Accelerated Perception:
 * Superhuman Speed:
 * Aerokinesis:
 * Interdimensional Travel:
 * Speed Mirage:
 * Superhuman Agility:
 * Superhuman Momentum:
 * Superhuman Reflexes:
 * Time Travel:
 * Retrocognition:
 * Time Remnant Creation:
 * Superhuman Stamina:
 * Superhuman Strength:

Abilities

 * Business Acumen:
 * Computer Specialist:
 * Deception:
 * Expert Scientist:
 * Master Engineer:
 * Expert Tactician:
 * Genius-Level Intellect:
 * Hand-to-Hand Combat:
 * '''Knife Fighting
 * Stick Fighting:
 * Intimidation:
 * Leadership:
 * Medical Knowledge:
 * Multilingualism:

Current Weaknesses

 * Anti-Speedster Weapons:
 * Cold Temperatures:
 * Irregular Gravity:
 * Lack of a Host Body:
 * Nanites:
 * Positive Tachyons:
 * Timeline Alterations:

Former Weaknesses

 * Cicada's Dagger:
 * Negative Speed Force Connection Flux:

Former Equipment

 * Future Technology:
 * Appearance-Stealing Cord:
 * Biomolecular Enhancer:
 * Watch:
 * Gideon:
 * Reverse-Flash Ring:
 * Reverse-Flash Suits:
 * Spear of Destiny:
 * Tachyon Device:
 * Wheelchair:

Former Equipment

 * Appearance-Stealing Cord: Thawne used an appearance-stealing cord to steal the identity of Harrison Wells.

In-Universe

 * Eobard appears to be a fan of the Back to the Future franchise and Ghostbusters. It's also implied he has seen It's a Wonderful Life.
 * Eobard claims to have never seen any Buster Keaton movies.
 * Eobard appears in a flashback in a deleted scene from in which he tells Caitlin that he doesn't want people to judge her based on her decision to stay at S.T.A.R. Labs after the particle accelerator explosion.
 * Eobard enjoys food from Big Belly Burger due to cows being extinct in his era.
 * Eobard claims to have been a match for Barry Allen's speed in 2024.
 * Tom Cavanagh has stated that Eobard never lied to Barry in season 1 because it wasn't necessary.
 * Eobard despises guns.
 * Eobard invented the Anti-Speedster Rifles.
 * Eobard claimed to have loved working with Team Flash in but claimed that he hated every minute of it in.