There’s an episode of the Simpsons where it is revealed that Martin, one of Bart’s school chums, is actually a grown man with a wife and kids who has been working undercover.
That’s a story with legs!
Creed on The Office. I’ve been able to work out with a few clues that he probably killed and assumed the identity of the guitarist for the Grass Roots, but other than that his life is a tantalizing mystery.
Here’s a really minor character: Audrey in Alice Doesn’t Live Here Anymore, played by Jodie Foster. She has only a few minutes of screen time in which she gets drunk, shoplifts, taken to jail, and hauled home by her cranky mother. At which point, she gives the legendary line, “So long, suckers!”
There’s got to be more to her story.
I feel obliged to mention that the Bronze Age ended ca. 1300 BCE, and the following Iron Age ended ca. 550 BCE. The era for this girl was called, among other things, classical antiquity.
She really only had to convince one person, her husband. After that, the special effects took over.
I always figured she was considered a virgin because they were unmarried. Some kind of propriety thing. Then it got blown out of all proportion.
Not in the four canonical Gospels.
Carl Gallagher from Shameless. The second-youngest who went to military school. I’d love to see him go into the military. I picture him ending up in logistics, a procurement command or managing a large supply depot. So much fodder for both hilarity and serious exposition that the public ought to see.
In Beverly Hills Cop, the scene-stealing Bronson Pinchot played a wacky, foreign-accented man named Serge. That character would be a great one to build an entire sitcom around! They’d just need to provide the character with a backstory, an uptight straightman for him to play off, and a suitable premise to have the two of them live or work together. Like, maybe he’s a bumpkin from some remote Balkan country who travels to America to live with his distant cousin…
From the original Highlander movie, Kastagir. We see him briefly, meeting MacLeod and reminiscing about their past history, and then him fighting and losing to the Kurgan.
But in those few moments, he really stands out as a guy who seems to have really just enjoyed the hell out of being immortal, none of that moping around that MacLeod does. I’d like to see more of him, partying his way through significant historical events.
The extended Star Wars universe did this. They published two books of stories, one telling tales of the aliens in the Mos Eisley cantina, and one of the creatures found in Jabba’s palace.
Don’t be ridiculous.
Got a chapter and verse?
My favorite Biblical character, besides Jesus of course, is Candace, an Ethiopian queen mentioned in passing in Acts. I get the impression that she was a badass. Maybe another cache of Dead Sea scrolls will be discovered, and we will find out more about her.
p.s. Her name has many spellings; my translation calls her “Candace.”
From Andor:
Kleya
Vel
Cinta
Melshi
Brasso
Wilmon
Perrin
Sculdun
The “rebellions are built on hope” clerk at the hotel
The Force healer
Partagaz
Kino Loy
Krennic
So, basically everyone.
From the excellent TV series ‘Sherlock’:
Sherlock (TV Series 2010–2017) - IMDb
I would really enjoy seeing Inspector Lestrade (played by Rupert Graves) in his own series.
Sherlock Holmes could have the occasional cameo. 
Perhaps they could adapt MJ Trow’s Lestrase books, with a modern setting.
You misspelled “Get the F#$% out of here!”
“Don’t be ridiculous” was often said by Pinchot’s character Balki in Perfect Strangers, which is the reference/joke @duality72 was making.
I have plans for a hit broadway musical, Cold. It’s the story of a misunderstood, rebellious iceberg who leaves home to seek his fortune and is hit by a huge, reckless ocean liner. Hilarity ensues.
Now I just have to write it.
Plot twist: The story takes place in 1898