Well, it might be a human from the future sent on a special mission or a robotic entity exploring unknown territories. The possibilities are endless in the realm of science fiction.
Who goes first really depends on the story's setup. It could be a character introduced early to establish the setting, or it could be a mysterious figure whose actions trigger the entire narrative.
Comic Con attracts all kinds of folks. You'll find hardcore comic book collectors, people passionate about sci-fi and fantasy, and those just wanting to have a good time surrounded by like-minded individuals. It's a diverse crowd with a shared love for all things nerdy and fun.
It could be either. It depends on the specific work you're referring to. Some versions might be short stories, while others could be expanded into novels.