Pre-Series
This is my backstory post detailing a vague timeline for An's childhood and background. It starts after the Serpentine War, when Wu meets their mother (who, I'll admit, I don't have a name for), all the way to the start of the pilot.
Wu meets {NAME} after Misako and Garmadon announce their engagement. He wants to get over Misako, since he's truly happy for them to have found happiness, so the two end up dating. Um, to put it simply, one night neither can remember ends up in {NAME} disappearing and Wu thinking they're broken up. He is very surprised to find a baby on the doorstep to the Monastery, with a short note saying the baby is his.
Insert a very embarrassing conversation with his brother and Misako, since he hadn't even told them about {NAME} because she disappeared before he felt it was time, and now he has a child to care for.
To quickly deal with the Time Battle, since I think that happens around this time period, I'm going to say it happened 1 year after An's birth, and once Wu realized what was happening, he asked Misako to take An and babysit until it's all over, wherever she lives outside of the Monastery.
Once the battle is over, An has a pretty normal life in the Monastery. She frequently visits Jamanaki Village and gets along well enough with the children there. She's homeschooled, so she knows a lot about their family history, which overlaps a LOT with Ninjago's history, and her father agrees to teach her martial arts, and eventually Spinjitzu.
An is around 10 when Lloyd is born. I forgot to specify when Misako and Garmadon marry, but I've always had the headcanon that, regardless of when that happens, Garmadon is hesitant about having kids due to the Great Devourer's venom making his temper and evil tendencies worse. So, at some point after the Battle, they're married, and yes, An participates in the ceremony.
An adores her cousin. She always wants to hold him and take him everywhere. If he's around, every activity now is meant for two.
Uncle Garmadon's temper is getting worse, and An even notices it when he visits. He keeps snapping at her father, but Aunt Misako tells her that he manages it very well and he's trying to be better. He just can't help it sometimes.
A year after Lloyd was born, An wakes up to Wu and Garmadon's fight over the Weapons of Creation. She snuck out of her room, so she saw the ending of it, with her uncle nearly killing her father and being banished through a weird light, but she immediately ran back to her room and pretended to be sleeping when her father checked up on her, so he doesn't know.
After the battle, he drops her off at her Aunt's house, goes to hide the weapons, and gives the map to Kai and Nya's parents.
An learns about the prophecy later, but her father refuses to elaborate on what's written or entertain who it might be. [I'm generally under the idea that they know about Morro, but it's back-and-forth. I do know that they would not have met him.]
When An is 14-15, her father starts bringing in students to train. First, it was Cole, then Jay, then Zane. Around this time, An also masters a rudimentary and wobbly version of Spinjitzu.
2 years after Zane showed up, Wu brings over a boy named Kai, who says his sister Nya was kidnapped by skeletons.
An's role in the pilot episodes is to stay and help her father. She pretty much stays at his side until he falls into the underworld, and she barely manages to lead the group after that. They sneak off to get him back, and she reluctantly follows them and is shocked to see her uncle.
