Ultra Violet/guide

Rabbit
Go to the Crayon World and enter the shop, collect the coins on the floor around the shop then use 300 coins to buy the Rabbit effect from the rabbit seller.

Headless
Go to the Meat World and find a headless dead body that has blood on the neck at the top-right corner from the door, interact the neck will give you the Headless effect.

Magician
Go to the Forest World and find a small green building to the Church, go right to the Dark Forest and go to the exit will lead you to a door to the Library, find a door to a room that has a blonde girl and magic circle, interact with her will give you the Magician effect.

Lampost
Go to the Ancient World and go up to the stair that you first reach, go through the doors until you reach an entrance to the Lampost World, than find a short lampost that gives you the Lampost effect.

Nail Hammer
Go to the Old Building World and go right to a dark room with lots of obstacles, go up to the exit to a light blue hallway (better with Lampost effect), you can find a metal locker, go into a room with buttons and interact with the computer, follow the hint and push the buttons will make the locker open, interact with the flesh in the locker gives you the Nail Hammer effect.

Cake
Go to the Crayon World and find a nail to the Nail Teleport Maze, each time you reach 2 portal you choose [right, down, up], then interact with the nail to the Cave and go out, go right to the Cookie World and find the cake castle, interact with the cake NPC on the top of the castle gives you the Cake effect.

Coat and Muffler
Go to the Ancient World and go to the stair on the right, find an entrance that lead you to the Building, go up and enter a room with a stand before going up to the rooftop, interact with it leads you to the Block World, find the coat and muffler that give you the Coat and Muffler effect.

Egg
Go to the Crayon World and find a nail to the Nail Teleport Maze, each time you reach 2 portal you choose [left, right, right], then interact with the nail to the Elevator Maze, enter the first elevator then go left and enter 2 more elevator to a place that has an egg which leads you to the Egg World, find an white egg that gives you the Egg effect.

Android
Go to the Neon World, go [up, left, left, down, down, right] and enter the entrance to the Spaceship, go to the top and interact with a female robbot that gives you the Android effect.

Short Hair
Go to the Old Building World and go up to a door that is blocked by the boxes, use Nail Hammer effect to destroy the boxes and enter the door, interact with the closet that has blood on the top-right corner to the Red Water World, avoid the chasers and enter a building that has a big scissors, interact with it gives you the Short Hair effect.

Miko
Go to the Snow World and interact with the green tree on the left to the Summer World, go between 2 stone in the farm then go up to the Shinto Shrine, find a room that has a Saisen Box and a Miko, pay 1000 yen to the Saisen Box will give you the Miko effect. (Hint: The room and the Shinto Shrine are in different map, it is helpful if you don't have enough money.)

Shikkenken
Go to the Snow World and find a child/winter youkai that is jumping, interact with him/her will give you the Shikkenken effect.

Ribbons/Pigtails
Go to the Neon World, go [up, left, left, up] and enter the entrance to the FC world, go to the town and enter the house on the top to the FC Dungeon, each time you reach the places that have 2 doors above you choose [left, right, the 3rd door from left] to a room that has a FC girl NPC that gives you the Ribbons effect.

Sea Hare
Go to Ocean World and find a pink Sea Hare, interact with it gives you the Sea Hare effect.

orange
Go to the Snow World and find a girl that wearing Muffler.

violett
Go to the Ancient World and go to the stair on the right, find an entrance that lead you to the Building, go up until you reach the rooftop, equip the Magician effect and start the flight event.