Yes, he has. Markiplier often does unique and entertaining segments, and this could be one of them. He likes to interact with different types of content related to his fan base, and reading fanfics, even the not - so - good ones, is a way to do that.
I don't think it's a true story. Such heist scenarios are often the creation of writers and storytellers to provide thrilling and adventurous experiences. There's no evidence to suggest it's based on reality.
His friends like Wade and Bob could be main characters. They would be the ones who first notice the change and try to help him. They might have some really funny reactions and also help him come to terms with being a girl. Maybe there could also be a mysterious character who caused the transformation in the first place and they have to find this person to reverse it.
Sure. 'A Heist with Markiplier' is an interactive story. It starts with the basic premise of planning and executing a heist. Throughout the story, there are numerous choices for the viewers to make. These choices lead to different outcomes and multiple endings. For example, you might choose a different partner for the heist, and that can completely change the flow of the story, from the obstacles you face to the final result of the heist.
There is no truth to it. Fanfiction often involves fictional and sometimes outlandish scenarios. Markiplier is a well - known content creator, and while fanfiction can be creative, it's important to remember it's not based on real events.