Now that I've finally introduced y'all to Abstract, here's some backstory.
Poppy found Abstract in the river when she was 4. Abstract had no memory of anything before waking up on that rock and seeing Poppy for the first time. Besides being in the water, there were no signs of where she had come from.
One day, after living in Pop village for almost a month, Abstract noticed a bird flying by with something in its claws. She stared for a few minutes and realized it was an egg. The bird suddenly let it go. Abstract panicked, the egg was falling from super high, there was no way it would land safely. She jumped up and turned her legs into a tail and flew as high as she could. She caught the egg, wrapping up her arms and tail around it as best as she could to keep it safe. The weight and size of the egg sent her falling down a bit, but she still saved the egg. There wasn't a single crack on it.
King Peppy had a sister-in-law named Charlotte Lyric. Her brother being King Peppy's deceased husband and Princess Poppy's other father. Charlotte had trouble having an egg of her own. Even if she succeeded(and thats a big if), the egg didn't hatch. She practically jumped at the chance to adopt Abstract(at least until if her parents showed up). And shortly after Abstract brought the egg to King Peppy and Charlotte, Charlotte took in the egg too. Abstract was ecstatic, she was excited to have a younger sibling, adopted or not.
There was Branch who also lived with them...but Abstract barely got the chance to talk to him. He was always off doing something else. The only time he was ever at the pod was during bedtime.
After the egg hatched, Charlotte named the child Catherine(until she later came out as transgender, converted, and changed his name to Cooper). Abstract noticed that her sibling was being made fun of for being so different from everyone else. Abstract was occasionally made fun of as well. She once found Cooper alone after being made fun of again. She took that chance to show him that she was different and "weird" like him too. Cooper was amazed by his big sister's transformation abilities and how proud she was of them despite being made fun of for it. Cooper started taking pride in his differences too.
Desperate to be able to bond with Branch as well, Abstract woke up earlier right before the sun rose like he did and followed him. She found him digging extremely deep into the ground and storing food in rooms that he had already made. She went back to the pod and packed a bag with some lemonade and apples. She waited for Cooper to wake up and grabbed a shovel for each of them. She made sure to let their mom know what she was setting out to do and headed to the spot she followed Branch to with Cooper. She also made sure nobody followed them. By the time she and Cooper got there, Branch was getting out to take a break. He was shocked to see them. Abstract handed him an apple and a bottle of lemonade, scolding him for skipping breakfast. She told him that they were gonna make sure he didn't skip anymore meals and they were gonna help him dig whatever it was he was trying to dig. He accepted the food but insisted he didn't need help. And then he asked why they would even bother wanting to even exist around him. He was different from the rest, he didn't belong with everyone else. He was a weirdo. Abstract told him that not only was he technically their brother, but she and Cooper were considered weirdos as well. And weirdos gotta stick together.
This Sub-Genre All-Genre Kingdom AU is gonna be a really interesting one I swear. This is some of Abstract's backstory. At least most of the main points and important details. There will be more coming soon.