Gall was born to two alcoholic parents. His mother being an earth pony and his father being a bat-pony. They were careless towards their kids and overall didn’t take care of them or even acknowledge them.
As soon as was 18 he left home and never returned, meeting the gang and becoming an assassin with them.
He fell in love the moment he saw Emery, eventually wedding her and they’re currently planning on starting a family. (He’s hoping for at least one colt)
He’s a little snooty and overall a smart stallion. But he’s very anxious and easily startled. How Emery managed to wriggle her way into his nervous heart remains unknown.