Avengers:
* Iron Man: Tony Stark
* Captain America: Steve Rogers
* Thor: God of Thunder
* Hulk: Bruce Banner
* Black Widow: Natasha Romanoff
* Hawkeye: Clint Barton
* Scarlet Witch: Wanda Maximoff
* Vision: Synthezoid
* Spider-Man: Peter Parker
* Black Panther: T'Challa
* Captain Marvel: Carol Danvers
* Ant-Man: Scott Lang
* Wasp: Hope van Dyne
* Doctor Strange: Stephen Strange
* War Machine: James Rhodes
X-Men:
* Professor X: Charles Xavier
* Cyclops: Scott Summers
* Wolverine: Logan
* Storm: Ororo Munroe
* Jean Grey: Phoenix
* Beast: Hank McCoy
* Iceman: Bobby Drake
* Nightcrawler: Kurt Wagner
* Rogue: Anna Marie
* Gambit: Remy LeBeau
Fantastic Four:
* Mr. Fantastic: Reed Richards
* Invisible Woman: Sue Storm
* The Thing: Ben Grimm
* Human Torch: Johnny Storm
Spider-Man Family:
* Spider-Man: Peter Parker
* Miles Morales: Spider-Man
* Gwen Stacy: Spider-Gwen
* Aunt May: Peter's aunt
* Mary Jane Watson: Peter's wife
Other Notable Heroes:
* Daredevil: Matt Murdock
* Punisher: Frank Castle
* Deadpool: Wade Wilson
* Doctor Doom: Victor von Doom
* Silver Surfer: Norrin Radd
* Ghost Rider: Johnny Blaze
* Blade: Half-vampire, half-human
* The Punisher: Frank Castle
* She-Hulk: Jennifer Walters
* Moon Knight: Marc Spector
* Luke Cage: Power Man
* Jessica Jones: Jewel
* Shang-Chi: Master of Kung Fu
* Elektra: Assassin
* The Defenders: A team of heroes who work together to protect the Earth
Note: This is only a fraction of the characters in the Marvel Universe. There are countless more, many with specific teams or solo series. You can find lists of all Marvel characters by searching online or visiting Marvel's official website.