I'm not sure which specific Jim Brockmire you are referring to. There could be many people with this name. If it's from a particular show or story, more context is needed.
Since we don't have enough information about who Jim Brockmire is exactly in this context, it's impossible to say what we know about his wife. Maybe he's from a book, but there are countless books out there. If you can say if it's a contemporary story, a historical one, or something else, that would help.
Definitely not. Brockmire is purely fictional. The creators came up with the idea and developed the story from their imagination, not based on real events or people.
Well, the origin story of Brockmire as played by Hank Azaria might have been inspired by real - life sports announcers and their quirks. The writers perhaps saw an opportunity to create a character that could be both comical and tragic. They developed a backstory for him that includes his fall from grace in the world of sports announcing, and Azaria was able to portray all the nuances of this complex character.
Maybe Jim is the protagonist who goes through various adventures and experiences. Or, he could be a key figure influencing the events in the story. Without more details, it's hard to say exactly.
The origin story probably began with the idea of a flawed but interesting character. As a sports announcer, Brockmire has a certain public persona. But behind that, there are problems. Hank Azaria took on this role and added his own touch. His character's origin might involve some past event that led to his current state in the story.
In a fanfiction about them, perhaps there's a plot where Evil Jim manages to steal Jim's body or powers. Then Jim has to find a way to get them back. He could enlist the help of his friends, like Princess What - s - Her - Name. Meanwhile, Evil Jim, in Jim's body, starts to cause chaos in the universe. Jim has to outwit Evil Jim and regain his true form. This could involve a series of comical and action - packed adventures as Jim tries different tactics to defeat his evil self.