Often when making a character, I will examine the HX of the character. What makes the character special enough to write about. Why, as a writer, do I feel this character is worth my time and investment? Can I find interest in the character and motivation to explore the character completely if I can, then I have a main character that I want to write about. I don't throw out a thousand characters simply because I want to focus on a few quality characters that I find enjoyable to write about. 

Read over your characters, find the one(s) that you want to know more about, the characters whose histories are worth exploration as well as seeing where their futures lie.