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Among several NPCs that the players possess while playing Slitterhead, the Rarities stand out due to their in-depth character design and abilities. However, you can choose to make them look even more distinct by using alternative costumes/outfits. There are several unlockable outfits for playable NPCs in the game, although, some might be a bit tougher to unlock than others.
There are 16 distinct Rarity costumes/outfits that players can unlock while progressing through Slitterhead. You can try on the unlocked outfit in the Closet menu, but do note that each costume is designed for a particular Rarity and cannot be equipped on another one. Here are the details of all the costumes/outfits and how to unlock them in Slitterhead.
Rarity
Costume/Outfit
Mission
How To Unlock
Julee
Long-Sleeve Shirt
Lurking Parasite RE (2nd Loop)
Target your attacks at the body hanging at the back of the Orchid Mantis Slitterhead boss.
Dropping the body will unlock the outfit.
T-Shirt
Missing Girl RE (2nd Loop)
Make your way through the markets and turn right towards the overpass staircase to interact with a shrine.
Defeat the Shrine Guardian "Tiger", Slitterhead, summoned by the Shrine.
Apron
The Duel
Defeat Julee (Leopard Head) boss during the mission.
Tank Top
Bind Break
After receiving the "Pursue Slitterhead with the release key" task, head on top of one of the buildings with the neon signs.
Interact with the Shrine on the roof to summon Shrine Guardian "Pig" Slitterhead.
Defeat it to unlock the outfit/costume.
Anita
Cheongsam (White)
Sleepless Zone RE (2nd Loop)
Target your attacks at the body hanging at the back of the Giant Leaf Insect Slitterhead boss.
Dropping the body will unlock the costume.
Edo
Under Shirt
Hidden Cave RE (2nd Loop)
Interact with the Shrine at the start of the mission to summon Guardian "Dragon" Slitterhead.
Defeat the boss to acquire the outfit.
No Shirt
Jar Of Poison RE (2nd Loop)
After returning to the kitchen, head upstairs to the 3rd floor to interact with the Shrine.
Interacting with the Shrine will summon minion Slitterheads and taking them down will make one of them transform into the Shrine Guardian "Snake" Slitterhead boss.
Defeat the boss to unlock the outfit.
Doni
Uniform (Waist Tie)
Mantis Trap
Defeat Michelle, the final boss of the mission to unlock the costume.
Uniform (Jacket Top)
Jar Of Poison RE (2nd Loop)
Target your attacks at the body hanging at the back of the Warty Frogfish Slitterhead boss.
Dropping the body will unlock the outfit.
Blake
Shirt
Oppressive Force RE (2nd Loop)
Interact with the Shrine on the top of one of the buildings near the overpass to summon the Shrine Guardian "Rabbit", Slitterhead boss.
Defeating the boss will unlock the outfit.
Suspenders
Black Payback REV (Mirror)
Target your attacks at the body hanging at the back of the Greater Blue-Ringed Octopus Slitterhead boss.
Dropping the body will unlock the costume.
Alex
Under Shirt
Insidious Sucker RE (2nd Loop)
At the start of the mission, turn left and head down the alley to interact with a shrine to summon Shrine Guardian "Money."
Defeating all the minion Slitterheads will unlock the outfit.
Lab Coat
Over Limit
Target your attacks at the body hanging at the back of the Lisa "Mimic Octopus" Slitterhead boss.
Dropping the body will unlock the costume.
Biker Jacket
Ghost Family RE RE (3rd Loop)
At the start of the mission, possess an NPC in an orange color room through an open window.
Next, keep possessing NPCs to head up the building until you reach the 3rd floor.
Head down the hall and go through the open door on the right to interact with a shrine and summon the Shrine Guardian "Sheep" Slitterhead boss.
Defeat the boss to unlock the outfit.
Tri
Dark Theme
Drifting Devil
Defeat the Yin Yue boss at the end of the mission to unlock the costume.
Betty
Marguerite Theme
Bind Break
Play with Betty in the team.
Keep civilian casualties low.
Target your attacks at the body hanging at the back of the Weedy Stingfish Slitterhead boss to drop it.
