When is the first time you know these marvel superheroes. For me, here is the list below for my first knowing of each heroes.
Spider-Man = Sam Raimi's Spider Man trilogy
Iron Man = MCU
Captain America = MCU
Thor = MCU
Wolverine = Fox's X-Men
Storm = Fox's X-Men
Hawkeye = MCU
Fantastic Four = Fantastic Four (2004)
Captain Marvel = MAA
Iron Fist = MAA
Daredevil = MAA
Luke Cage = MAA
Jessica Jones = Netflix
Black Panther = MAA
Wasp = MAA
Ant-Man = MAA
Guardians of the Galaxy = MCU
Scarlet Witch = MAA
Jean Grey = Fox's X-Men
Emma Frost = X-Men First Class
Miles Morales = Comic
Giant-Man = MAA
Ms. Marvel = MAA
Inhumans (Black Bolt, Medusa, Crystal, Gorgon) = MAA
Loki = MCU
Vision = MAA
Ultron = MAA
Mockingbird = MAA
Spider-Woman = MAA
Hela = MAA
Falcon = MCU
She-Hulk = MAA
Hellcat = MAA
Baron Zemo = MAA
Abomination = MCU
M.O.D.O.K = MAA
Magneto = Fox's X-Men
And the list goes on so I decide to stop here. (Also, MAA stands as "Marvel Avengers Alliance")