Venom is a Marvel Comics character, and arguably one of the most famous of Spider-Man's Rogues Gallery, though over time his character and motivation have evolved. To date there have been four different men who have assumed the mantle of Venom. The Eddie Brock version of the character was playable in the video game adaptation to the Maximum Carnage story arc, then in Separation Anxiety, and later, the first and second Marvel vs. Capcom, making the leap from comic to video game. Mac Gargan was playable as Venom in the second Marvel Ultimate Alliance game, with Eddie Brock's appearance as an alternate costume. Brock, as Anti-Venom, is an antagonist in Spider-Man: Edge of Time, marking the character's first appearance in a video-game.Venom's origin began with an alien symbiote that was used to build a new suit for Spider-Man, inspired design-wise by the second Spider-Woman (Julia Carpenter) during their team-up in Secret Wars. The costume change was initially unpopular with fans (although the black costume would later be brought back as fans began to like it a bit more) so it quickly went through a Retcon as an alien symbiote that wanted to bond with Peter Parker. Horrified, Spidey managed to repel the symbiote by taking advantage of its weakness to sonic noises via church bells. Some writers and editors did not like Peter's motivation at the time so there was a second Retcon that the suit was more powerful than his ordinary suit, but was slowly driving him insane with rage.The creature ultimately survived going on to bond to a series of hosts (many that bore grudges against Spider-Man), developing from a lonely alien creature to a bloodthirsty monstrosity, and remains one of Spider-Man's deadliest foes, despite of and due to the lingering desire it still possesses for him. It popularity among creators and fans has made it among the most memorable of Spider-Man Rogues Gallery. Currently it is bonded to long time Spider-Man supporting character Flash Thompson and featured in Venom Volume 2 and the current Thunderbolts series. After Venom vol.2 has been cancelled, Flash has been announced to appear in Superior Spider-Man story arc and later join Guardians of the Galaxy.The symbiote remaining bonded to Spider-Man or bonding to a character other than Eddie Brock has been the focus of numerous What Ifs, and alternate versions of the character are present in alternate universes, most prominently in Ultimate Marvel and Marvel 2099. For tropes related to indivdual hosts or characters from the series, there is a Character Sheet here.Venom has so far had two entries into Marvel Avengers Alliance - Mac Gargan Venom appears as a boss, and in December 2013 Flash Thompson Venom was announced, alongside Nico Minoru, to be the next playable characters to join the roster.
Tropes pertaining to the Venom Symbiote:
Adaptive Armor: What the symbiote often acts as for the host. Bonus points for it actually looking like body armor when bonded to Flash.
All Webbed Up: The symbiote produces organic webbing from its biomass, and Peter has exploited this to weaken it.
Angel Face, Demon Face: The way the symbiote costume looks ties closely with the relative morality of the host. On the heroic side, Peter's suit looks more or less like his usual costume but in black; heroic soldier Flash Thompson wears what looks like body armor (unless he loses his temper); and in the Spider-Girl series, Normie Osborn had what looked like the usual suit but with his face visible underneath and no fangs. On the evil side of things, Eddie Brock's costume has More Teeth than the Osmond Family and a lolling tongue; when the eviler Mac Gargan wears the suit, it looks even more freaky and bestial than Brock's usual version (unless he uses a Power Limiter).
Animal-Themed Superbeing: Venom is a spider-based villain, justified in that the symbiote's first and favorite host was Spider-Man. Considering his third host was previously called The Scorpion, this trope was doubled, in a way.
Blank White Eyes: The symbiote has large white eyes originally in the shape of Spider-Man's lenses, though after bonding to Eddie Brock they became distorted. When bonded to him, Mac Gargan's own eyes were visible, although tinted green with Hellish Pupils; and when under control Venom IV's eyes are black lenses rimmed with white.
Blatant Lies: Reassures Flash Thompson it prefers him to Eddie Brock... immediately before abandoning him to rebond with Eddie, proclaiming "Home, sweet symbiosis!" Flash had to plead with it and remind it that Eddie would constantly fight it for it to return to him.
Characterization Marches On: The symbiote was exiled from its planet for refusing to kill its hosts, which deemed it a freak amongst its species. That's right, Venom was the one exception to an Always Chaotic Evil race. Of course, this characterization doesn't make a good villain, and was promptly forgotten by every writer on the planet, as nowadays it's usually presented as a man-eating parasitic monstrosity.
Chronic Backstabbing Disorder: Its favorite hosts are Spider-Man and Eddie Brock in that order, and if the opportunity to rebond with either of them presents itself the symbiote will happily screw over its current host to do so.
Clingy Costume: It does not like letting go of a host, and in fact hates Spider-Man so much because of how close they came to being physically merged forever before he forced them apart.
During the Minimum Carnage arc, Marquis Radu creates clones of the Venom and Carnage symbiotes in the body banks and fuses them together. Carnage cheerfully dubs the union incestuous and seizes control of the clones to kill Venom.
Clothes Make the Superman: The symbiote can bestow superpowers on mundane hosts, mainly patterned after Spider-Man's due to its absorption of his DNA, and can also drastically boost the powers of superpowered hosts. A deconstruction, as it shows exactly what happens when your clothes have that kind of power...
Combat Tentacles: One of the symbiote's methods of long-ranged attack, although Venom usually uses them in the guise of webbing.
Deal with the Devil: Made a deal with Memphisto to obtain demonic powers via the Hell Mark, though it later admitted this was a mistake.
Demonic Possession: Daimon Hellstrom possesses the symbiote with a powerful demon to turn it into one of his Monsters of Evil, but Venom uses the hell mark to suppress it. While the symbiote and the demon initially get along, the symbiote realizes the demon is slowly pulling a Grand Theft Me on it and shunts the hell mark and demon onto its long-devoured clone, which it pukes up and bonds to Andi, turning her into Mania.
It doesn't have fangs when bonded to Peter or Flash... as long as he keeps his cool.
Food Chain of Evil: The symbiotes are the preferred prey of the Xenophages, who find ones that have been bonded to their host for long time (like Venom) to be particularly delectable.
Genetic Memory: Possesses genetic memories of the symbiote species' prior conquests.
Glasgow Grin: Its mouth is disturbingly wide and lacks cheeks.
Handicapped Badass: The US Army used a drug - possibly the same one Norman Osborn gave Mac Gargan - to chemically lobotomize the symbiote, greatly limiting its ability to influence Flash. However, the drug's effects only lasts for 48 hours and the symbiote has found ways to work around it.
Horror Hunger: Much like its Ultimate counterpart, the symbiote has become a ravenous blob of teeth and tentacles.
I Am A Humanitarian: The symbiote has acquired quite the taste for human flesh. The 1996 The Hunger miniseries explained that the symbiote needs a certain chemical for its own health, which can be found most abundantly in two sources: human brains, and chocolate, but this seems to have been forgotten following the symbiote's separation from Eddie.
Iconic Logo: The stylized white spider emblem on its chest and back, though each host other than Peter, Eddie, and Mania - who share the same design - has a unique variation.
Lost in Imitation: The idea that the symbiote was mentally afflicting Peter as part of its efforts to merge with him stems from the 1994 Spiderman The Animated Series cartoon, and was promptly adopted into the comics due to the fact that the initial depiction of the seperation kind of made Peter look like the bad guy.
More Teeth than the Osmond Family: After bonding with Eddie the symbiote consistently manifests a wide mouth of fangs even when not bonded to a host. Spider-Man practically said this word-for-word in one story.
Muscles Are Meaningful: The symbiote significantly bulks its host up, although Flash's default form is more of Heroic Build. In an early appearance Brock mentions that the suit amplifies his own strength, so if the host gets stronger, Venom becomes exponentially stronger. This is more evident with Mac Gargan, whose strength was amplified from 15 tons to 60 tons by the symbiote.
Official Fan-Submitted Content: The design for Spider-Man's black suit was created by a fan named Randy Schueller, who submitted it to a contest. Mike Zeke altered it slightly by changing the chest and hand emblems from red to white, and the symbiote was born.
Puppeteer Parasite: While bonded to Peter, the symbiote would take his body out for crime-fighting joy-rides while he was sleeping. After bonding to Eddie the symbiote developed a habit of usurping control of its subsequent hosts Mac Gargan and Flash and going on feeding frenzies.
Ultimate Marvel: Has a counterpart there, in the form of a bio-engineered protoplasmic entity created as a cancer cure. Unfortunately, this "symbiote" is genetically tailored to the Parker family's DNA, so it starts devouring any other host that tries to wear it (like Ultimate Eddie Brock), forcing them to consume the biomass of other beings to survive.
Upgrade vs. Prototype Fight: The Carnage symbiote is more resistant to attacks that affect Venom, is even stronger than him and Spider-Man combined, and has abilities the Venom symbiote doesn't. However, since Kasady is a Complete Monster next to Brock's Anti-Hero (and pretty often there's other heroes like Spider-Man there to help 'soften up' Carnage), Venom most often comes out on top. This is played with during the Minimum Carnage arc, where Flash is forced to emulate Carnage in order to defeat him.
His weakness towards fire was greatly Flanderized in the nineties; In one instance, Spider-Man was able to fend him off with a lighter. Yes, the villain who once bested the Human Torch was frightened off by a tiny little flame. However, in the Siege arc, tossing Mac Gargan into an inferno does nothing more than piss him off.
Yandere: The symbiote really can't stand the idea of any of its favorite hosts not wanting to be with it, and jumps at almost any opportunity to rebond with them when it isn't trying to kill them.