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Welp- not really old and new facts or anything, but I can sense most people didn't know about the gaster's backstory lore so... Here are some lore about the gang + Swapfell
Wingding: While he's just the normal gaster around him. Got PTSD dure of war and he was just a kid who had to be mature to his brothers (Sans and Papyrus). Technically after fall to his creation, he accidentally open the portal to other gasters that close to him. He always overwork and being his grumpy side. And everyone, especially Swap treats him like a child (since he's youngest)
Swap: Born to a culture that's about riverperson. His father left his mother at young age. Left his culture after marriage(?) but got divorced after his wife committed adultery and he got full custody on his sons. He blames himself for Papyrus's bad habit. He's happy go lucky to cheer everyone up to not remind himself on his past
B: Was actually born prince. He was flirty and very gentleman. Born to be a king, forced to be a advisor after his kingdom got destroy and lost his eye as a result. Gave 40% of his soul to Sans, his apprentice/kin. And first to leave the war to hide. Act strongly to humans but he's chill most of the time... Unless he's on heat. He never met Papyrus dure of Sans and Papyrus separate at birth.
Fell: Abandoned at just newborn. Got move to different foster and orphanage at his young age, he decided to run away to with the doggo in his timeline (and fun fact, Fell wanted to fit in so he sharpen his teeth). Married to a woman named Rosanna to actually protect her since she got pregnant by a rich guy but he left her bc his reputation is more important than a random girl from a farm. Unfortunately, he lost his wife and child so he joined the war. Adopted Sans and Papyrus after their family home got burn down years after the monsters trapped underground.
Stars: Half alien, half monster (no, this is not a joke). His father is a high rank alien from "The Order" in his planet. Often got bullied because of his half monster side but proved them wrong as he can destroy and create stars. Left his planet to research (although his father don't like it but he left him anyway). Actually married to an alien but he didn't know it. Becomes a scientist and Sans being his student. The only one doesn't know how bad humans are dure of him exploring the world while monsters attacking humans. He's a kind and sweet person... But the person that you shouldn't made mad at.
Swapfell: Lost his family at young age yet had to live with a very strict and bad orphanage. He developed schizophrenia a bit. And time goes by, he became a doctor and married a singer and have a family. But lost his wife and his mental issues git worse. He tried to commit suicide but failed. He got welcome to the gang. But betrayed them by spiking them, hurting B and almost experiment on him when Fell stopped him. He's the main reason why the gang being cautious.
(Note: This is based of my memory that I line up. So any mistake please tell me right away :))
(A/N: Correction for Fell's wife's name, it's actually Rosanna, not Rosalina. Her nickname is Rosey/Rose)