Spitfire

Josephine Maria "Josie" Vasquez-Stark is a member and co-founder of WEB who is the biological daughter of Tony Stark and Diana Vasquez. She, along with her best friend Spider-Man, fight crime across New York City as the alter ego Spitfire.

Early Life
Josie was born Josephine Maria Vasquez to Diana Vasquez and (unbeknownst to him) Tony Stark on December 15, 2000. She grew up in Queens, New York City, with her mother, aunt and maternal grandmother. She grew up not knowing who her father was, but after Tony stark visited her mother's restaurant she started hanging around the billionaire more.

Later, after snooping through her mother's diary, she found out that Stark was actually her father and confronted him. He admitted to it and they start bonding as father and daughter. In 2014, after catching his daughter working one-too many times in his lab, Tony suggests that Josie start attending Midtown School of Science and Technology where Josie will eventually meet and befriend Peter Parker and Ned Leeds.

Avengers: Age of Ultron
After the fall of Sokovia, Tony decided to retire as an active member of the Avengers and Josie yelled at him for putting his life at risk.

Knowing that her father will one day be called to once again fight, she devises to build her own hero suit using her father's technology so she can fight beside him.

Captain America: Civil War
When Tony is called to fight against Team Cap, Josie follows her father as he heads to Berlin——not knowing that he had recruited Spider-Man to his team.

At the airport battle, she surprises everyone when she pops up but Tony and Rhodey are not fooled and know exactly who it is under the mask. She helps aid Spider-Man a lot during the fight and when the web-shooter speaks, Josie seems to recognize who is under the mask.

After the fight, Tony scolds her for breaking into his lab, making a suit and flying off without permission to Germany to which Josie cheekily responds that she is her father's daughter. Tony makes her promise that she will take on lower level criminals and enhanced individuals akin to the same talk he will eventually give to Spider-Man.

Spider-Man: Homecoming
Having returned to school following the airport battle, Josie meets up with her friends Peter and Ned, making up a story of her recent absence.

Following Flash Thompson's teasing of Peter's Intern of Stark Industries story, Josie stands up to Flash and says that she believes him and that Flash is jealous because he can't get a Stark Internship. When the rest of the class laughs, Peter (surprised) thanks her for standing up for him, but doesn't ask why she did.

As Spider-Man gets closer to uncovering the Vulture's plans, Josie joins his side and after the final battle, she tells him who she is.

In Between Spider-Man: Homecoming and Avengers: Infinity War
Eventually, Peter and Ned find out that Josie is the daughter of Tony, but promise to not reveal her secret.

Avengers: Infinity War and Avengers: Endgame
Josie joins Peter with helping her father, and Doctor Strange in space and both of them disappear from existence after Thanos snaps his fingers.

In the years following the Snap, Tony does everything he can to try and figure out how to bring his daughter back and succeeds. Him and the rest of the Avengers defeat Thanos.

Spider-Man: Far From Home
Following the battle with Thanos, Tony takes a sabbatical and travels, leaving the superhero stuff to others. During this sabbatical he marries Pepper Potts, has his second daughter Morgan and then goes off the grid for a while.

On the Europe trip following, Peter and Josie try to just be regular teenagers. They both make plans to confess their feelings to their crushes Michelle Jones and Jake Waters respectively.

The plans go awry when they are recruited by Nick Fury to fight the Elementals alongside Quentin Beck, a former associate of Tony Stark's.

They later learn of Beck's true colors and try to fight him off together, and with the help of Happy Hogan, Peter and Josie make new suits and fight off Beck together.

Having made their confessions of feelings, the couples go on a double date. Peter started swinging over high distances and ran on walls of a building, apologizing to the employees who were inside of it. As Spider-Man kept on web-slinging around New York City, he received a text from Jones, saying he shouldn't text and swing before almost hitting himself against a bus. After swiftly dodging it, Spider-Man ran on top of the bus and continued on web-swinging.

Going up on a building to gain some momentum, Spider-Man shot his webbing at the top and ran on the side of rooftop, giving him edge to jump off it and dive straight into the air. As he neared the location he intended, Spider-Man activated his equipped web-wings and glided through a new opening in the former Avengers Tower to the Grand Central monument. He then landed on a street pole to break his momentum, and spun down to plant his feet to meet Jones.

Josie flew with her new suit, right behind him and joins Parker on the floor where they are met with Jake Waters as well. Both apologized to them about being late. As they both tell them it was fine, Spider-Man and Spitfire ask them if they're ready. Starting their dates, Spider-Man swung with Jones across New York, and Josie flew with Waters.

At Madison Square Garden, Spider-Man asked if Jones was fine, as Jones assured him that she was indeed but admitted to not enjoying the ride with him.

They both decide to stay on the ground with both of their partners.

Taking notice of the breaking news broadcast from the NY1 station, Spider-Man turned around to watch the outer television monitor of the stadium. As news anchor Pat Kiernan reported on the attack in London, Spider-Man listened closely about an anonymous source that provided video of Mysterio's final moments before his death. As Mysterio talked over in the video, Spider-Man and Spitfire are accused for killing him and staging a crisis to try and become the "next Iron Man."

When Kiernan went on about having the footage being cited from the controversial online news site, The Daily Bugle, the online tabloid's host, J. Jonah Jameson, accused Spider-Man and Spitfire to be responsible of the murder of Mysterio, who would go down in history as the greatest superhero of all time. As Jameson went on, the broadcast showed more footage, displaying Mysterio revealing Spider-Man and Spitfire's civilian identities as well as the fact that Josie is the illegitimate daughter of Tony Stark/Iron Man.

Aftermath of Far From Home
With their identities now known by the world, Peter and Josie were brought in for questioning by the police where they met their lawyer, Matt Murdock.

After the Acquittal
After Peter and Josie are acquitted for their crimes, they two return to school to finish off their high school days. As soon as they do, Tony returns to Stark Industries and recruits Peter and Josie to join him.

Soon enough, Josie comes up with a new idea to help nurture the minds of promising young engineers. With the help of Peter, Scott Lang's daughter Cassie (who was interning at PYM Technologies at this time) and Tony's old friend, Harley Keener, they founded the Worldwide Engineering Brigade or WEB. With WEB they would be able to experiment with their own skills and technology provided by Stark Industries, Wakanda, PYM Technologies.

Josie would later meet Harry Osborn, the son of Norman Osborn, at a charity event where Harry was there to support his dad's company Oscorp. After talking to the young Osborn, Josie asks Harry to join W.E.B which he agrees to join as a liaison between W.E.B and Oscorp.

Notes and Trivia

 * Her birthdate being in December of 2000 means that she is the oldest of her friends as they were all born in 2001
 * She has shown that she can speak Spanish (and most likely Italian). She also knows Sign Language.
 * It wasn't until after her and Parker were aquitted of their crimes that she started using a hyphenated last name
 * Like her friends Peter and Ned, Josie is a big Star Wars fan
 * She is a Mets fan
 * Flash Thompson has made advances towards Josie, especially after she was outed as Tony Stark's daughter which she has rebuffed plenty of times