Tyrone Gambol

Early Life
Tyrone was born to well meaning but poor parents in Gotham City. Tyrone's life was somewhat normal up until he turned three when his mother was shot down by a white supremacist and his father got fired from his considerably wealthy job. As a result, they were forced to migrate to Park Row, AKA "Crime Alley". Tyrone grew up with his father hardly in his life and began acting up due to this, eventually culminating when he was twelve when he attempted to steal from crime lord Rupert Thorne's car. One of Thorne's men caught Tyrone and took him to meet Thorne himself, who surprisingly saw a fire in the boy's eyes and admired his guts to rob him at such a young age. Deciding to nurture the boy's rebellious and angry nature, Thorne took the Gambol family under his protection and even paid for Tyrone to go to school at Gotham University, one of the greatest schools in all of Gotham. As a bonus, Thorne got to pretend that it was him taking pity on a poor family when, in reality, he was planning to raise Tyrone to be the perfect monster.

Rising Up in Crime
When he was 21, Tyrone officially joined Thorne's gang as a thanks for all the years he had helped. To prove his worth, Tyrone was trusted with finding and killing a mole who had infiltrated Thorne's gang. To do this, Tyrone planned a fake heist and told all the people he suspected to be the mole about it, though he changed the bank he planned on robbing with each story. Upon finding out the police had lined up at Gotham National Bank, Tyrone instantly knew who the mole was and confronted him about it, beating him to death. Shortly after this, Tyrone became Thorne's golden boy and was trusted with all of his most important missions, with him also becoming Thorne's personal bodyguard.

Death
In 2006, the infamous Joker had made his first appearance and was very quickly rising in the Gotham Underworld. Not wanting Joker to come for his territory next, Thorne hired Tyrone to kneecap Joker before he could grow any larger. To do this, Tyrone announced to Joker that Thorne had become afraid of him and wanted to willingly give his land over but that he wanted to have a meeting with the Joker first. Joker agreed and a few weeks later, Tyrone met with Joker, planning on having his men burst into the room and gun Joker down.

Tyrone did a very good job of acting and it seemed as if his plan would go off without a problem. However, when his men burst into the room, Tyrone got cocky. He began bragging to the Joker, claiming over and over that he'd be the man who killed him. In response, Joker asked if he could have one thing before he died: he wanted to show everyone a magic trick. Joker pulled out a pencil and stood it up on a table, claiming he'd make it disappear. He counted down from three and, when he reached one, he grabbed Tyrone's head and bashed it into the pencil before stealing Tyrone's gun and using it to single handedly kill everyone in the room. After this, the Joker proved that he was, indeed, the most dangerous man in Gotham and filmed himself dumping Tyrone's body into Slaughter Swamp before sending the tape to Thorne.

Solomon Grundy
The mystical energy in Slaughter Swamp slowly seeped into Tyrone's corpse and, on August 21, 2006, a group of children were taken on a fieldtrip to Slaughter Swamp as a Halloween surprise to them. While there, the magic energy in Tyrone's corpse finally peaked and resurrected him. He swam to the surface of the swamp, hearing the children sing the Nursery rhyme "Solomon Grundy", which Tyrone mistook for his name. Tyrone (or Grundy now) burst out of the swamp and scared the children away. Grundy had no memory of his past as Tyrone Gambol but remembered that he hated the Joker and rampaged through the streets, demanding to know where Joker was. Upon finding out that Joker was in Arkham Asylum at the time, Grundy burst through Arkham security and almost caused a mass breakout of criminals before he was stopped by Batman, who knocked him into the ocean.

However, while Grundy died a second time that day, it wasn't for long. As Grundy would return every Monday only to return to his grave every Sunday, becoming a very persistent thorn in the sides of the superhero community, most notably Batman's and Superman's. More recently, Grundy seems to have gained at least a sliver of his intelligence back, though he is nowhere near the smartest around. His regained sentience has allowed him to join the supervillain group, The Society, who have promised to protect Grundy whenever he asks for it.

Powers

 * Zombie Physiology: Due to his connection to The Black, Gambol lives in a state between life and death that can best be described as "zombie-like". He has no pulse or brainwaves but is able to move around and function with ease. Due to being "dead", he isn't held back by the boundaries of living people.
 * Superhuman Strength: Grundy's immense strength is enough to let him go toe-to-toe with Superman. In spite of this, he is mainly an enemy of Batman's and is thus one of his strongest and most likely his hardest to fight enemy.
 * Superhuman Durability: Grundy is one of the most durable people on the planet. He is able to take punches from several Justice League members and has survived all-out attacks from military weapons, including missiles.
 * Resurrection: Grundy's main ability is the power of resurrection. No matter how many times he's killed or defeated, Grundy comes back every Monday for more.
 * Regeneration: Grundy seems to have the ability to regenerate his body parts while resurrecting, as he has had his limbs torn off and has even had his head blown to pieces but has returned with all of his limbs completely fine.
 * Energy Absorption: The ability that makes Grundy truly dangerous is his ability to absorb energy-based attacks. He was able to absorb the kinetic force of people's punches, absorb Superman's heat vision, and was even able to absorb a Green Guardian ring's blasts.

Former Abilities

 * Genius Intelligence: When he was Gambol, he had the mind of a savant and managed to come up with strategies and plans that let him come out on top nine times out of ten. After dying, not so much.
 * Expert Combatant: Gambol was able to go toe-to-toe with incredible martial artists and was infamously known for his speed. As Grundy though, he mainly defaults to blindly beating his opponents without much thought.

Weaknesses

 * Diminished Intelligence: After coming back from the dead, Grundy's once genius intelligence was greatly affected. He would only speak in simplistic sentences, could only refer to himself in the third person, and had trouble processing certain events. He also became a lot more prone to rage and violent fits. It's theorized this may have been caused by Joker's pencil being stabbed into his brain. More recently, he's become better at understanding situations and has a better memory but he is still unable to come up with strategies or think his actions through.
 * Time Limit: Grundy has a time limit on how long he can be on the mortal plane. He dies every Saturday but comes back every Monday.

Trivia

 * June 7 was a Monday in 1965 and May 20 was a Saturday in 2006. Meaning Gambol was born on a Monday and died on a Saturday.
 * During Grundy's second resurrection, he woke up in the sewers not long after being kicked into the ocean and met a recently scarred Harvey Dent. Grundy didn't know what to do and defaulted to singing the Solomon Grundy rhyme. Hearing the rhyme made Dent realize it was possible for a man to live two lives.