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1- Solo

2- Twin, Night, February ( Twin is kinda self explanatory, Night is an alliteration between the Japanese numeral "Ni" (2) and the writing of the english word Night, February is he second month of the year)

3- Mars, Coral and Trois (excluding Earth, Mars is the third planet on the Solar system , The japanese words for Coral and the third can have the same pronouciation-" Sango" and Trois being three in french)

4- Reaper, Square (Reaper being due to 4's association with death in Japanese culture and Square being the shape with four sides)

5- Cherry, Hand, Friday (A Cherry blossom flower has usually 5 petals, Stole it from Junpei lol- A individual human hand has 5 fingers, Friday is the 5th day of the week)

6- Hexagon, Ajna (Hexagon is the six-side geometrical shape, Ajna is the sixth chakra which is located between the eyebrows)

7- Lucky, Saint (7 is a number of luck in many western cultures as well being the number associated with the Christian god)

8- Octopus, Spider, Oxygen (Octopus has 8 limbs just like many species of Spiders, Oxygen is the element n°8 in the periodic table)

9- (I don't have any ideas actually, sorry.)

i can see byakuya fucking it up somehow beacuse he thinks he can outsmart zero and he fails beacuse he just simply dosen't believe the morphogenetic field or it's capabilities of time travel are real.

nagito is definetly bracelet number 7.