I really like how your idea happens quarterly. I think it's important to keep people on track throughout the year, and weekly or monthly updates can sometimes just be too much. Really great job, good luck in the rest of your prototyping and refinement!
I have used the Strengths Quest test in many work/team environments and I have always found it to be super useful and interesting. At my job, people have name cards on their desks with their top 5 strengths listed, and it's always fun to start conversation with someone who has a similar strength as you.
I've also taken the Myers-Briggs test, but I'm not sure how much that one relates to the workplace.