The first and most well-known symbiote is Venom, who originally attached itself to Spider-Man during the 1985 Secret Wars miniseries. After Spider-Man rejected it upon discovering its true evil nature, the symbiote bonded with his rival, Eddie Brock, with whom it first became Venom.
After ingesting a chemical given to him by Norman Osborn, Venom transforms into a more human appearance similar to the Black-Suited Spider-Man. Osborn introduces him as The Amazing Spider-Man, a member of the Dark Avengers, while unveiling the team.
Most folks are familiar with the fact that the symbiote who would come to be known as Venom first bonded with Peter Parker. It got a taste of the power of Spider-Man and grew to love that power. It grew to love the feeling of the wind on its face swinging through the city. It loved the force behind every punch.
Marvel Comics' new version of Venom has become the most powerful symbiote ever. Dylan Brock, the son of the original Venom host, Eddie, has unlocked a new power that allows him to sever a symbiote's connection to the hive mind, which makes him a threat even for the all-powerful Kings in Black.
Venom's twisted hate of Spider-Man, and his brief time as Spider-Man's costume, has led to his powers continuing to mimic Spider-Man's. Venom has a warning sense due to its alien origin and can swing from building to building in a similar manner as Spider-Man, using "webs" generated from the symbiote.
In Ultimate Spider-Man Issue 35 Peter is using the power of "The Suit" to track down a criminal and when he gets a hold of him he absolutely loses it and when he does the suit begins to change form and adapt to his rage to look like none other than Venom.
The Carnage symbiote was the offspring of the Venom alien, who bonded with notorious serial killer Cletus Kasady and became one of the most horrible supervillains in the Marvel universe. Boasting greater strength and abilities, this new symbiote was far more lethal than Venom.
Venom, although the most famous Symbiote, is not the most powerful; other Symbiotes such as Toxin and Anti-Venom surpass him in strength. Tthe most powerful Symbiote is a literal god of darkness, with the ability to destroy Celestials.
After spending so long with Spider-Man as its host, the symbiote is able to mimic all his abilities, which is why Venom has all the same powers as Spider-Man, only amplified. This means that Venom is stronger and faster than the web-slinger, not to mention far more brutal.
Basically, the symbiote didn't attempted to talk with Peter because it wanted to remain loyal and obedient like a servant. It didn't felt the need to talk to him, only to serve him.
During the storyline "Planet Of The Symbiotes," Venom is briefly separated from Flash, then proceeds to bonds with Groot, Rocket, and Drax at various points. This series offered fans a glimpse at what each of the Guardians would look like bonded to the Venom symbiote thanks to a series of unlikely events.
Venom came to empathize with Eddie's status as a "loser", eventually deciding to turn on its own kind and save the Earth from being invaded. The symbiote ultimately agreed to work alongside Eddie as a vigilante, to only hurt bad people despite its own confusion of how it can tell the difference of who is good or bad.
Ticked off by the Hulk's arrogance, Venom attacks him a second time with full force. Though the Hulk is far superior in strength, Venom actually holds his own and puts up a good fight with his enhanced agility and reflexes.
The idea that he would become stronger after eating Carnage seems to come from an idea that he would be absorbing Carnage's symbiote powers and properties into himself, therefore becoming stronger. However, unlike the mutant powers of Rogue, Venom is not absorbing Carnage but consuming him.
Extremely loud sounds (or extremely high frequency sound waves) can shock the symbiote, and even cause him to separate from his host. Spider-Man discovered this not long after meeting Venom.
Carnage. Easily the most ruthless and dangerous of all of Marvel's Earth-based symbiotes, Carnage has been plagued since its inception by the evil of its first host, notorious serial killer Cletus Kasady.
With every symbiote, the ability to spawn a new puts the former in danger, as there is a possibility of the spawn is normally more powerful than the former. Knowing this, if venom were to spawn again, carnage would be rendered useless against the newer spawn, whether it be his or venom's.
Marvel and DC actually pitted these two super-powered beings against each other in All Access #1...and shockingly, Venom is actually stronger than Superman.
The hierarchy of symbiote colors is now established, with red symbiotes being naturally stronger than black ones. The white Anti-Venom is considered one of the strongest symbiotes, further solidifying the hierarchy and establishing its position at the top.
Venom's symbiote has explained on many occasions that the Klyntar planet is practically devoid of emotions, yet over time he knows that he forms genuine love for Eddie. Venom bonds more with Eddie and experiences guilt, jealousy, and sadness over his other half.
Being discovered by Spider-Man during the Secret Wars, it bonded to him and assimilated his powers into its own genome. Unfortunately, it was later discarded by Spider-Man when he learned it was alive and sentient, as he was disgusted by the idea of permanently bonding to it.
