Booster Gold is an admitted thief, was expelled from Gotham City University, and all he's after is fame and glory because he was kind of a loser in the 25th century.
Why would the other Leaguemates allow him to join?
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Booster Gold is a fictional DC Comics superhero. Created by Dan Jurgens, he first appeared in Booster Gold #1 (February 1986) and has been a member of the Justice League, DC Comics' all-star team of heroes. The character is initially depicted as a glory-seeking showboat from the future, using knowledge of historical events and futuristic technology to stage high-publicity heroics. Booster develops over the course of his publication history and through personal tragedies to become a true hero weighed down by the reputation he has created for himself.
Booster Gold was labeled "The Best New Hero You Never Heard Of." The intent of the hero was to question what makes a hero, technology, ability, or upbringing. The character of Booster Gold has suffered significant change from its initial development so it isn't hard to question how he could end up being a member of the Justice League in any form. If your exposure to the character is from Smallville, your opinion of him might be even worse.
Being a thief or a wrong-doer is does not immediately disqualify a hero from being a member of the Justice League. Several of their members have had questionable run-ins with the law or have fought against the legal system.
The real issue for the Justice League is more one of evolving character. Booster Gold did start off with a questionable pedigree for a hero, and his return to the past, using his future knowledge did not bode well. He, through trial and error, support from other heroes, guidance from his AI Skeets, personal tragedies, including the death of his closest friend Ted Kord, the Blue Beetle, began to show the real character of a man who wanted to and could become a real hero.
Nor is the history of the Justice League as perfect as we would like to believe. It has also had some questionable behaviors in some if its iterations. The Justice League is a brand name and sometimes the brand suffered depending on who was a member of the line-up at the time.
Booster Gold's induction to the Justice League International in the previous DCU was eventually something he grew to fit. If you want to see how many different changes the character has been through, you need to read through his Wikipedia entry.
I read the adventures of Booster Gold both when he had his own book and almost all of his appearances in the JLI comics for many years trying to see DC was working so hard to make the hero successful. If you haven't had the pleasure, he and the Blue Beetle made the Justice League International the hit that it was. Humor can sell comics.
I realized, probably the same way DC did, they needed to try harder to bring new heroes into the fold. Recycling their universes without adding new heroes would eventually fail their industry. Booster Gold is an example of that ideal. While my love of the character has not grown, my respect for what has been done to make him a better and more respectable hero has grown significantly.
His pedigree in the new DCnU and whether he will make the cut for the League is still anyone's guess.