My idea is a hybrid of two other ideas on the site (The Dynamic Triangle & Learning Infographic) and my own special sauce.
I'd like to see a tool that would take data from multiple stakeholders (the student, their teachers and parents) and create an infographic that paints a picture of the student. I'd be interested to see the commonalities and differences in the viewpoints from the multiple parties. This could be particularly interesting in seeing how they interpret not only the academic successes and challenges, but also social emotional health, resilience, etc. I think that the visual component of an infographic and the multiple data points (via the stakeholders) might paint the learner in a different light and positively enhance the conference.
I'd be very interested in seeing if there was a way to make this both visually appealing and streamlined on the creation side for teachers. Cumbersome tools never see use.