The Blue Hulk

The Blue Hulk is a result of Bruce Banner trying to drown himself. When Bruce Banner's wife died, he went to the deepest part of the ocean, and put a gun to his head. When he couldn't bring himself to do it, he shot holes in the boat and sank with it. In the process, he turned into Hulk. But even Hulk can drown. He sank to the bottom of the sea and drowned.

When a S.H.I.E.L.D submarine found him lying at the bottom of the sea 10 years later, they brought him to the S.H.I.E.L.D Agency and put him in a radioactive water tank. After charging the radioactivity up, they brought the Hulk back to life. The process had turned him blue, and he had a different personality. Because he was brought to life as the Hulk, he was permanently the Hulk. When he came back, the agents noticed a radioactive light emanating from him. They found that he was now radioactive. 

Later, when the leader managed to throw him back into the very place he committed suicide, he found that he could breathe underwater. When the leader left, he jumped out and  threw radioactive waves at the ship they were sailing on. He managed to destroy the ship, and kill the Leader. However, one of the people was still alive. The Red Hulk. He sought out the Red Hulk, and eventually killed him. Blue Hulk killed many of Spiderman and Thor's enemies. He killed 3 of Iron Man's enemies, and 10 of S.H.I.E.L.D's enemies. When S.H.I.E.L.D found a cure similar to Bruce Banner's one that made him Grey Hulk, he was able to return to his human form. Although he looked like Bruce Banner still, he called himself Draco Kazacar. Kazacar was not much different than Blue Hulk, and could turn into him at will. When he joined the Avengers again, he was welcomed kindly.

He had always felt like something was missing, though. He had thought assuming a human form would fix that, but he still felt that way. When he asked Stark, he replied with effort, and told him about his old life. Draco was saddened at this, and wasn't seen for many years. He occasionally appeared in the worldwide news, but was soon gone after that. After years of searching, they found Draco, and he returned to the Avengers.

Powers and Abilities

• Transformation: Draco can transform into Blue Hulk at will

• Superhuman Strength: The Blue Hulk's highest measured strength has been 500 tons, though this is not his true limit, as Draco restrains most of his strength.

• Superhuman Leaping: Blue Hulk was known for jumping all the way around the world at 473 MPH. 

• Superhuman Lungs: The Blue Hulk can inhale great quantities of air for several effects. The Hulk can expel the air at great speeds to knock down forests and even armed troops. 

• Superhuman Stamina: The Blue Hulk is immune to most diseases and can only pass out for a few moments.

• Superhuman Durability: Blue Hulk is able to withstand blows 10 times stronger than Hercules' Mightiest blows.

• Regenerative Healing Factor: Despite the fact that almost nothing can hurt him. Some things can like, Adamantium or Vibranium. He can regenerate a broken or destroyed limb within seconds.

• Immunity to All Earth-Based Diseases and Viruses: The Blue Hulk is immune to all known Earth-based diseases and viruses.

• Longevity: Due to his Regenerative Healing Factor, Blue Hulk has an extended lifespan. Some even say his body lives forever.

• Superhuman Speed: Despite his size, Blue Hulk can run as fast as 3,000 miles per hour. He once outran a Jet Plane. He is also known to have Lightning Fast Reflexes.

• Underwater Breathing: As stated above, the Blue Hulk found that he had the ability to breathe underwater when the Leader threw him off a boat.

• Resistance to Psychic Control: Blue Hulk has displayed his "near immunity" against Dr. Strange, and even Professor X. He has been able to resist mind control ever since he was Green Hulk.
• Extrasensory Perception

• Astral Form Perception: The Blue Hulk can see astral forms or "Ghosts" that no one else can see. He once saw a whole ghost village in the desert. 

• Homing Ability: The Blue Hulk has displayed the ability to track things using his mind only.

• Gamma Radiation/Energy Manipulation and Emission: The Blue Hulk is able to use gamma radiation against his enemies, and also absorb it.

• Radiation waves: The Blue Hulk is able to produce radiation and throw it at his enemies. He is also able to produce a massive sonic wave with radiation by slamming his fists on the ground.

• Extensive Mind-Span: Kazacar has displayed his knowledge in science, Math, and language at many occasions.

• Telepathy: Blue Hulk is able to communicate with the rest of the Avengers with his mind, however, with effort, this ability can be blocked.

• Supersonic Waves: Due to being brought to life with Radiation, Blue Hulk can emit supersonic waves that can easily destroy most Symbiotes.

• Fire: Like his ability to create radiation waves, Blue Hulk can also shoot fire from his hands. He can also raise the temperature in his body at will.

Weaknesses
Blue Hulk's only weakness is Ice and/or freezing temperatures.