Tranquil Square is a landmark in Xenoblade Chronicles. It is located in the Residential District of Colony 9. It is an open space featuring some benches surrounding a tree and some house fronts. Betty and Françoise can be found here for most of the day (6:00 - 15:00) and Kenny Rohan is here from 9:00 - 15:00. There are also several nameless NPCs — a Nopon, a woman swooning over Kenny in the day, and a couple sitting on the benches at night.
These minor enemies only spawn during the Mechon attack on Colony 9.