The phrase "idea generator" refers to something or someone that can come up with new and creative thoughts or concepts. It is like a machine or a person that produces a lot of innovative ideas. Full definition
A good idea generator who can look at problems from different angles and view issues from a strategic level and produce creative solutions. (members.climber.com)
If you're an energetic idea generator but not good with details, hiring others who share that personality will doom your business to failure. (inc.com)