These are some of my favorite Spiderman characters, as shown on their cards.
PUMA
ORIGIN: The product of mystical rituals and controlled breeding , Thomas Fireheart abandoned his Indian tribe and used his warrior skills to begin a career as a costumed mercenary.
POWERS: Puma has superhuman strength enabling him to lift up to 12 tons. He also has enhanced animal senses and is an accomplished martial artist.
COMIC UNIVERSE: Rescued from near death by Nocturne the totally ruthless Puma accompanied her on a crusade to eliminate society's predators, only to be stopped and returned to humanity by Spider-man.
CARNAGE VS. VENOM 
THE VENOM FLOWS: When Cletus Kassidy first appeared as
Carnage, Spider-man needed Venom's help to defeat him. It was a
symbiote-to-symbiote battle, and though were robbed of our chance to
break the itsy-bitsy spider in two and chew on his brains, we were able
to mangle Carnage and stop the slaying of more innocents!!
You hear about people facing a crisis and receiving the powers of Captain Universe, but you never expect it to happen to anyone you know. Who would have thought that my already spectacular Spidey would need that kind of cosmic power? At first, Peter didn't know why he was getting stronger, but when the full Unit-power hit him with the truth behind his new abilities, he was able to defeat the Tri-sentinal.
M.J.
POWERS: The man-wolf has superhuman strength, agility, speed, and heightened senses, such as infrared night vision. His teeth and claws are strong enough to rend metal.
COMIC UNIVERSE: Finally free of the curse
of man-wolf, John Jamison took a job as security chief at Ravencroft
Institute, a position which has involved him in many dangerous situations.
POWERS: Spidey has the proportionate speed, strength and agility of a spider, can cling to almost any surface, has a spider-sense which warns him of danger and creates webbing with his web-shooters.
COMIC UNIVERSE: Having
faced countless super-villlians, criminal masterminds and other
super-powered psychos, Spider-man is now poised to confront his greatest
challenge yet: fatherhood!!
ORIGIN: As part of a plot to kill super-villian Venom, a normal woman was bonded with a spawn of Venom's alien symbiote costume and gained all of his powers and abilities!
POWERS: With her symbiote, the female symbiote is super-strong, can become invisible, projet a type of organic "webbing", adhere to any surface and mimic any type of clothing.
COMIC UNIVERSE: The female symbiote allegedly
sought Venom out to gain advice on how to deal with her alien half. In
truth she only wanted the chance to kill Venom for the evil she thought he
represented.
Spider-man Doppelganger is NOT Spider-man!! He is an evil creation who is brought to confront Spiderman and his allies.
Characteristics of Doppelganger
In the comic book novel Spider-man Maximum Carnage Carnage, after a series of fights involving Carnage, Spider-man and several allies of theirs, Spider-man Doppelganger is finally killed by Carnage when he is kicked off of a building.
DESCRIPTION
ORIGIN: Serial killer Cletus Kasady bonded with a spawn of the Venom symbiote left behind when his cell mate, Eddie "Venom" Brock escaped. Revealing in his newfound powers, Kasady became the chaotic killer called Carnage.
COMIC UNIVERSE: Carnage was briefly set free during JudasTraveller's takeover of the Ravencroft Institute, but was defeated by the combined efforts of Spider-man and the Scarlet Spider.
APPEARANCE: Blue and black costume, white spider on chest and back, gruesome mouth that is filled with very sharp teeth and a slime covered tongue, white squares on back of hand.
ORIGIN: Blaming Spider-man for the loss of his career, disgraced reporter, Eddie Brock bonded with the alien symbiote costume which shared Brock's hatred of the web-slinger, and the two began a campaign of vengeance.
POWERS: Venom's alien symbiote makes him stronger than Spider-man. He can project a type of organic "webbing", adhere to any surface, and mimic any type of clothing.
COMIC UNIVERSE: After being separated from his symbiote by the Scarlet Spider, Eddie Brock realized the many crimes he was responsible for as Venom. Once again reunited with his alien half, Brock wants to know if his costume was exerting a psychotic influence on him.
APPEARANCE: Red spandex body suit with mask. A torn blue sweatshirt with a black spider on it, utility belt with spare web cartridges on it.
Real name is Ben Reilly.
POWERS: Scarlet Spider has the proportionate speed, strength and agility of a spider. Can cling to almost any surface, has a spider-sense which warns him of danger and shoots webbing with web shooters. In other words Scarlet Spider has the same powers as Spider-man.
APPEARANCE: He wears a utility belt and a yellow and brown costume.
ORIGIN Herman Schultz, an unsuccessful burglar working in a prison workshop, used his mechanical aptitude to cobble together "vibro-shock" units which he used to escape and become a costumed criminal.
POWERS: Shocker has wrist-mounted units which produce air blasts, creating highly destructive vibrations. An insulated costume protects him with a vibrational force-field.
COMIC UNIVERSE: The Shocker was one of the costumed foes of Spider-man organized by Hobgoblin to hunt down and kill Kaine, a mission that was foiled by Spider-man.
APPEARANCE: No special costume (that I know of). Four mechanical arms, special sunglasses.
ORIGIN: Otto Octavius, a brilliant nuclear physicist, was using his specially designed mechanical arms to handle radioactive isotopes when a freak explosion permanently bonded the arms to his body.
POWERS: Doc Ock telepathically controls four titanium alloy arms which allow him to travel up to five miles per hour and lift up to three tons.
COMIC UNIVERSE: Dr. Octopus used his knowledge of biochemistry to cure Spider-man of a fatal illness. Despite his good deed, Dr. Octopus was soon after killed by the mysterious Kaine.
APPEARANCE: Light purple boots, gloves, and suit, elfish ears and green skin.
ORIGIN: The son of the original Green Goblin, Harry Osborn's mind snapped under the stress of drug abuse. He took on the identity of the Goblin for himself, carrying on his father's vendeta against against Spider-man.
POWERS: Like his father, the second Green Goblin travels on a jet-powered glider and uses Goblin related weaponry including glove blasters, pumpkin bombs and razor edged bats.
COMIC UNIVERSE: Waging a private war on his former best freind Peter (Spider-man) Parker, the Green Goblin finally perished due to the side effects of his own strength enhancing serum.