To unlock the Fanfare trophy in Jump Force, you will need to use emotions 100+ times.
At the main lobby, hold L1 and use the left stick to choose any of the available emotions. Keep pointing the left stick at the one you want and then release L1. Once the animation has finished, that will count as 1 use, so repeat the above steps as many times as needed.
After 10 uses of emotions, you will unlock the This Party Is Just Getting Started!