Chinese Nintendo on Twitter: "Boo's S. Chinese name was first found to be changed in Mario Tennis aces, but it was still unknown at that time of the change was temporary or
Mario-Tennis-Aces-Boo – Nintendo Times
Download Boo - Mario Tennis: Ultra Smash PNG Image with No Background - PNGkey.com
Mario Tennis: Ultra Smash Walkthrough Part 10 - Knockout Challenge (Unlocking Star Boo) - YouTube
Mario Tennis Aces: More From Adventure Mode & Additional Boo Hunt Details - Miketendo64