This is a little bit of a tricky question. Marvel had been integrated into Timely and Atlas for a while before releasing any titles on its own. The first comic that was officially labeled as Marvel comics was Amazing Adventures #3. See the related link below for more details.
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Spiderman
The fictional Marvel Comic character Gambit was created by Chris Claremont the writer and Jim Lee the artist. He was first brought in the comic in 1990.
Nope- he was created by the Marvel staff.
The comic book characters of "Sentinel" were created by Jack Kirby and Stan Lee. The first appearance of these characters was in 1965. The "Sentinel" is published by Marvel Comics.
Marvel Comics #1 (cover dated Oct. 1939) .
The first Marvel comic was Marvel Comics #1 printed in 1939 by Timely Comics.
It started as an old Marvel comic series.
No, the Green Hornet was not a Marvel Comics character. The Green Hornet was created by George W. Trendle and Fran Striker, and originally appeared in comics published by Harvey Comics and later by NOW Comics.
The Fantastic Four were the first Marvel heroes ever. So a Fantastic Four comic. -The first Marvel comic book ever was named Marvel Comics #1. It was released in October of 1939. It featured Namor and The Human Torch.
The very first Marvel comic book was "Marvel Comics #1," published in 1939. This issue featured the debut of characters like the Human Torch and Namor the Sub-Mariner.
The Marvel comic known as XSE, or Xavier's Security Enforcers, was created by Whilce Portacio, John Byrne, and Art Thibert. The XSE is a team of mutants that is determined in catching criminal mutants.
ATLAS, was the first name of the 1933 publishing company which was started by Martin Goodman a relative of the company's writer Stan Lee who created most of the Marvel comic characters, that in the fall of 1961 became known as Marvel Comics.