2 Green Pigmentation. The Hulks are iconic green monsters. Their skin is green. They bleed green.
Gamma Radiation is electromagnetic radiation of the shortest wavelength, and is emitted by the Infinity Stones. Gamma radiation was absorbed by Bruce Banner after he used it in his Super Soldier Serum, transforming him into Hulk.
The Hulk is typically seen as a hulking man with green skin, hair, and eyes, wearing only a pair of torn purple pants that survive his physical transformation as the character progressed.
This Red Hulk was created through the combination of both gamma radiation and cosmic rays, creating a threatening red appearance. Red Hulks have been seen in both Thaddeus Ross and Betty Ross. It's a far contrast from that of the original green Hulk, but remains equally powerful.
Canonically, Bruce knows his blood is dangerous if ingested, so there's no way he would ever purposefully give his cousin a transfusion.
During the initial test of the Gamma Bomb, Banner was exposed to intense, massive gamma radiation, which, due to an unknown genetic factor in his body did not kill him, but instead caused him to transform sporadically into the superhumanly strong monster known as the Hulk.
Bruce explains that Hulks metabolize alcohol at an incredible rate and thus cannot get drunk, thus their drinking sessions are, "All buzz, no barf." The "buzz" experienced while consuming alcohol is a stage of drunkenness. If they cannot get drunk, they cannot get a buzz.
Tyrone Cash is a fictional character in the Ultimate Marvel universe. He is a member of The Ultimates and is described as being the first Hulk before Bruce Banner became the Hulk.
Stan Lee picked gray for the Hulk because he didn't want to invoke any associations with a particular ethnic group and because he wanted a color that would appear “scary and chilling.”
The Grey Hulk is actually a rather intelligent version of the Hulk. He calls himself Joe Fixit. He works as an enforcer for the mafia in Las Vegas, and gets all sorts of trouble. He's squared off against Spider-Man, Wolverine, and many more superhumans in the Marvel Universe.
Vibranium can also cut the Hulk due to the same reasoning as Adamantium -- they are two of the strongest metals in the world. The one thing to note is that when Hulk gets angrier, his skin becomes more durable and can then withstand even these metals.
Because of the thickness and strength of the Hulk's skin, it's nearly impossible for any form of artillery to hurt him. Sure, everyone's seen bullets bounce off of the Hulk, but when we say he's bulletproof what we really mean is he's BULLETPROOF.
As you know, Bruce is a pretty thin guy, so we assume his junk is pretty standard — but The Hulk's junk is going to be massive. This is going to make sex a real gamble because you might end up with a 20-inch-long and 7-inch-wide veiny rod of tissue in one of two orifices . . . neither of which is going to pleasant.
Due to the gamma radiation that birthed him, his skin is nearly indestructible and takes massive force to break. Throughout Hulk's many on-screen fights, he has only bled twice, and both circumstances prove it takes a unique set of variables to accomplish that.
During the Battle of the Rainbow Bridge, the two take their fight to the water, and Fenris rag dolls Hulk before biting into his leg, making him bleed.
History. During the time Bruce Banner lived in Rio de Janeiro, he worked in the Pingo Doce Bottling Plant. After Banner was cut, his gamma-irradiated blood dripped into one of the bottles where it was eventually drunk by the Watcher Informant in Milwaukee.
Remember that Gray Hulk might be the weakest version of the Hulk of all-time but there was one other time that Hulk went gray after that original appearance. This was when he turned into Mr. Fixit.
It goes as, “When he first appeared, Bruce Banner would transform into a grey-skinned Hulk. He was made green after the first few issues because when it came to printing comics, the grey tone in the four-colour printing process would come out different every time.
Depicted as an evil version of the Hulk from an alternate future (designated by Marvel Comics as Earth-9200), the Maestro possesses Bruce Banner's intelligence and the Hulk's strength and more malevolent personality traits.
Devil Hulk was made by Bruce to be a Protector Alter and an imaginary friend/father figure to watch over and love him. As such, devil Hulk cares greatly about Bruce and his well being while being extremely vengeful and violent towards anyone that hurts Bruce or tries to hurt him.
Apocalypse. Apocalypse makes his way into this position on the list because he is technically stronger than the Hulk. He also has a multitude of other abilities, including telepathy, telekinesis, and shapeshifting. And that's just touching the surface of his powers.
Losing Himself
Not to go too far down the rabbit hole of pop psychology, but what Hulk and Banner are most afraid of is losing themselves to one another. Banner is afraid of what will happen if he Hulks out, his anger takes over, and he can't regain control.
The Hulk fears the Void. Outside of that, Hulk fears nobody.
Due to this safeguard, the Professor is ultimately the weakest of the three primary Hulk incarnations despite being the physically largest. Professor Hulk has the attributes of three Hulks: Grey Hulk, Savage Hulk, and Banner.