There isn't a specific "fire girl" character in Avengers: Endgame, but you might be thinking of Captain Marvel (Brie Larson), who has energy/cosmic powers often depicted with light/fire, or perhaps Scarlet Witch (Elizabeth Olsen), known for fiery-red energy constructs, or maybe even Hope Van Dyne / Wasp (Evangeline Lilly) who has glowing energy wings. The most prominent female characters with powerful abilities are Captain Marvel and Scarlet Witch.
NoobMaster69 in Avengers: Endgame is the same character, Aaron, from Captain America: The Winter Soldier, an Apple Store employee who played Fortnite with Thor and Korg, revealed in a later Xbox tie-in commercial where his cousin (who created the name) appears, tying him back to the MCU's gamer tag in Endgame.
Lila Barton is only daughter of Clint Barton/Hawkeye and Laura Barton. She's the sister to Cooper and Nathaniel Barton. She lives at the Barton Family Farm with her family. Lila and her family are not in any government files, which is why the Barton Family Farm is used by the Avengers as a place to hide and lay low.
The fierce warrior Nebula is the adopted daughter of Thanos and the “sister” of Gamora. As the Mad Titan raised his “daughters,” he trained the two in combat, often forcing them to face off against each other.
In the Hawkeye series, Laura is revealed to be a S.H.I.E.L.D. agent and is away during the first episode on a mission, but her job as an agent isn't revealed until the final episode.
The watch was tied to Clint's wife's former stint as a S.H.I.E.L.D. agent and, if fallen into the wrong hands, could blow her cover and endanger his family.
Is Red Skull the son of Captain America? No way he is the son of Captain America in the MCU. But…. An alternate iteration has since been seen as the Ultimate Marvel equivalent of Red Skull, the secret son of Captain America (Steve Rogers) and Gail Richards.
Luna was the first child born to the Inhumans on her namesake, the moon (to which the Inhumans had recently relocated). She is the daughter of Pietro Maximoff, AKA Quicksilver, and Crystalia Amaquelin Maximoff, AKA Crystal, making her a Mutant/Inhuman hybrid and royalty on her mother's side.
She is depicted as a blue-skinned alien warrior who is both the adoptive daughter of Thanos, who killed her blood family before raising her, and the adoptive sister of Gamora, with whom she grew to share a bitter rivalry.
The Scarlet Witch is a regular character in Uncanny Avengers (2012), beginning with issue #1. The 2014 AXIS crossover retconned the character's parentage again, revealing Magneto is not biologically her father, contrary to that relationship's place in the canon for 32 years.
In Eternals (2021), Ajak reveals that the Blip delayed the onslaught of the Emergence for five years, as it halved the Earth's population from the necessary level needed for it to occur.
As the first major, openly gay character created by Marvel Comics, Northstar generated significant publicity in the mainstream press, and Alpha Flight #106 sold out in a week, although the series was not a very popular title.
He knew Tony for a long time. They also fought in a lot of battles together. They were like brothers. On top of that he had all the previous things happened which probably made him even more sad when Tony died.
The Biggest Marvel Movie Flops
The first F-bomb in the MCU was dropped by Chris Pratt as Peter Quill (Star-Lord) in Guardians of the Galaxy Vol. 3 during a scene where he tells Nebula to "open the f***ing door," a moment that broke the long-standing PG-13 language barrier for Marvel Studios films and was partially improvised by Pratt.
THOR HAD A SON WITH HELA, BUT HE KILLED HIM Modi Thorson was Thor's son in the Ultimate Universe (Earth-1610), born from Thor's deal with Hela to save Valkyrie. Raised by a villainous Loki, Modi grew to resent Thor.
Binary is a powerful cosmic superhero identity in Marvel Comics, originally belonging to Carol Danvers (Captain Marvel) after her transformation by the Brood, but in The Marvels movie, it refers to an alternate universe Maria Rambeau who joins the X-Men and gains cosmic powers, serving as an ally and counterpart to Monica Rambeau.
Pietro and his twin sister, Wanda, were raised by Django and Marya Maximoff, a gypsy couple. As adolescents Pietro and his sister Wanda discovered that they had peculiar talents.
Issue #6 (Dec. 1993) confirmed the character to be Nathan Christopher Summers, the son of Cyclops (Scott Summers) and Madelyne Pryor (Jean Grey's clone) who had been taken to the future in X-Factor #68 (July 1991), introduced by writer Chris Claremont, and appeared in Uncanny X-Men #201 (Jan. 1986).
Sterns worked as a janitor in Boise, Idaho when he was exposed to gamma radiation. This mutated him into a green-skinned, super-intelligent entity who named himself the Leader, embarking on a career of attempts at world domination.
Namor is revealed as the most hated Avenger, struggling with a violent legacy and self-loathing. Namor has been both a hero and a villain, causing controversy throughout his long history. In Namor #1, he must face his past and salvage his legacy while navigating prison and public disdain.
"The world is upside-down. People need something to get behind. They need a symbol." ―Bucky Barnes to Sam Wilson.
Despite its short run, Hugo Hercules is seen as the earliest superhero fiction comic. The Scarlet Pimpernel cited as perhaps the earliest superhero akin to those to become popularized through American comic books. L'Oiselle is noted as the first superheroïne overall.