Phantomilians are residents that have been trapped. There is said to be a total of six Phantomilians to be found throughout each vision. Visions are technically the missions within the game. Getting them all will net you with the Hero of Phantomile trophy achievement (Save dreamers from their nightmares)
They are one of the many collectibles within the game and look like little musical note bubbles. Although some Phantomilians can also be found inside Ngapoko eggs
When you have successfully managed to find a Phantomilian the game will then indicate how many you have left to find. The game will indicate this by showing a small collectible picture.
This specific guide will help you locate all 6 Phantomilians located within Vision 1-1 (The Beginnings of Gale)
PREVIOUS VISION: N/A
GUIDE: This one is rather easy to locate. You will find it by continuing along the path and crossing a bridge.
As you cross the bridge a tutorial will then pop up. This tutorial will tell you all about Phantomilians. Then shortly after the tutorial we will find our first one. Simply destroy the bubble to collect it.
GUIDE: Continue on through the vision mission as normal and eventually you will be forced to head up the hill. Once at the top of the hill the game will give us a tutorial on Fan Grass.
Use the Fan Grass to ride on up to the next Phantomilian
GUIDE: After sliding down the hill and getting the Fluttering Jump tutorial, we should then notice the Phantomilian just above the doorway.
GUIDE: After meeting the Old Man we will then want to head back outside. Here we will get a tutorial on Crossroads.
The next collectible is just by the doorway.
GUIDE: At the crossroads be sure to take the path up and towards the windmill. From there continue to follow the wooden plank around and to the next Phantomilian.
GUIDE: Return and continue along the bottom wooden plank now and we will get a tutorial on Find Mirror Spirits and Dream Stones!.
Keep going to find this next one.
NEXT VISION: Vision 1-2