Muyuu (ムユウ)/guide

Silk Hat (シルクハット)
Step on the red portal to Magma World, interact with the NPC that wears silk hat.

Color Pencil (いろえんぴつ)
Step on the blue portal to Ocean Floor, find a blue rope to the Docks, find a sketches NPC that gives you the effect.

Monochrome (モノクロ)
Step on the yellow portal to Nuclear World, find an area messes with dark holes, find the way to the center and interact with the black single eyed NPC.

Gill Breathing (えらこきゅう)
Step on the blue portal to Ocean Floor, find a seaweed to the Ocean Surface, find another seaweed to Isolated Ocean Floor, then through one more seaweed to Isolated Ocean Surface, interact with the blue NPC.

Snowboard (スノボー)
Step on the red portal to Magma World, find an underground stairway to the Wooden Maze, go left and jump down to the second path from the broken staircase, exit the door to the Isolated Snow World, go up and enter the cave then interact with the boy.