Marvel Comics took over a collection of properties as it came about in the late 1950s and 1960s. The first two MARVEL comics published as superhero books were the Fantastic Four and Spider-Man.... in that order in 1961 and 1962. However, the company that would become Marvel Comics created the Human Torch (android) in 1940, along with Captain America (1940) and the Sub-Mariner (1940). Joe Simon and Jack Kirby co-created Captain America for Timely comics... but the Human Torch predates the other two by a matter of weeks. Most comic historians will cite these three characters as the "first" marvel characters. At various times (1950s) & (1960s) all three were revived, with minor changes in origin, powers, situation, etc.
Thanos is a Marvel character. He first appeared in a Marvel comic in 1973 and has since become a prominent villain in various Marvel comics, movies, and TV shows.
Although there appears to be very little information regarding the character Ultraman Gaia is a fictional comic book superhero. She was first in the GenerationX #37 Marvel Comic.
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.
Day walker
Agent X is a Marvel Comic's character. He was first featured in Agent X issue #1 but was born out of the long running Deadpool comic series for example the comic titled "Deadpool: Agent of Weapon X".
Synch is a fictional mutant superhero that is featured in Marvel comics. The first comic with this fictional character was X-Men #36 which was published in September, 1994.
it isn't Batman, it is a Marvel Character called wildcat.
Captain America is a character published by Marvel Comics.
Spiderman
Hancock is not a Marvel or DC character; he is the main character in the 2008 film "Hancock" starring Will Smith. The character does not originate from any comic book series.
John Constantine is a DC comic book character.
Annihilus is a fictional character in the Marvel Comic Books. Annihilus was ranked number 1 best comic book villian of all time in 2009.