A page to house, at a glance, quick character comparisons-- ages, birthdays, heights, etc.! I find myself wanting this information all in one place with remarkable frequency, so hopefully someone else will get some use out of it.
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Characters By Age
Age
Character(s)
14 Years Old
Dongha
15 Years Old
Kenta
16 Years Old
Aoi
17 Years Old
Shiki, Reo, Kantaro, Itsuki, Rokuta
?? Years Old (18-19?)*
Ryu
19 Years Old
Kanata, Nayuta, Satsuki, Kei
20 Years Old
Anne, Shogo
21 Years Old
Allen, Hajun, Toma
22 Years Old
Shion
23 Years Old
Ryoga
24 Years Old
Hokusai
27 Years Old
Zen
28 Years Old
Yohei, Iori, Chungsung
32 Years Old
Yuto
34 Years Old
Saimon
36 Years Old
Haruomi
28/38 Years Old
Chisei**
*Ryu's age has never been officially listed, but context places him around 18-19; he is described as a young boy and behaves quite young in his appearance 9 years ago in "MEMORY", and his omission from an official alcohol collab featuring Saimon and Yohei might indicate that he is not of legal drinking age. Note that this is pure conjecture. Note that, as far as I can tell, there is no legal requirement to be 20+ to serve alcohol in Japan.
**Chisei's age is not listed on the website. A piece of official merchandise gives his age as 28; for various reasons, this is assumed to be a fake number. See this page for more information.
Character Birthdays (In Order)
Date
Character
January 1
Zen
January 15
Itsuki
January 31
Kei
February 7
Chungsung
February 14
Kantaro
March 3
Hokusai
March 20
Kenta
April 1
Ryu
April 8
Hajun
April 19
Aoi
May 2
Iori
May 15
Satsuki
May 28
Ryoga
June 12
Anne
June 21
Chisei
July 21
Reo
August 8
Shiki
August 12
Yuto
August 20
Shogo
August 28
Yohei
September 9
Haruomi
September 18
Saimon
October 1
Allen
October 10
Rokuta
November 11
Shion
November 26
Toma
December 7
Dongha
December 24
Kanata & Nayuta
Phantometals
Phantometal names and descriptions all sourced from the second fanbook.
Character
Phantometal
Description
Allen
Phoenix Pendant
A pendant with a phoenix motif. Activated by kissing.
Hajun
Feather Ring
A ring with a feather motif. Activated by kissing.
Anne
Finger Bracelet
A bracelet attached to a ring. Activated by kissing the bracelet.
Saimon
Classic Glasses
Black eyeglasses. Activated by taking them off and biting the temple.
Yohei
Skull Cigarette Holder
Activated by removing a cigarette from the pack, placing it in the holder, and lighting the cigarette.
Ryu
Compliance Tongue Piercing
An X-shaped tongue piercing. Activated by licking his own tongue.
Shiki
Rosary of Penitence
Activated by holding it in both hands as though in prayer and kissing it.
Kanata
Ouroboros Earring (Left)
An earring with a snake motif. Activated by biting Nayuta's piercing.
Nayuta
Ouroboros Earring (Right)
An earring with a snake motif. Activated by biting Kanata's piercing.
Iori
Pentagram Amulet
A necklace with a pentagram motif. Worn over top of his happi. Activated by kissing the pentagram.
Zen
Handcuff-Shaped Bracelet
A bracelet shaped like a pair of handcuffs. Activated by kissing.
Hokusai
Tiger-san Glove
The belt buckle on the wrist is engraved with the kanji for 'tiger', which all of Akan Yatsura wear somewhere on them. Activated by kissing the tiger decoration.
Satsuki
Butterfly Knife
A butterfly knife; activated by licking the blade.
Reo
Fang-Shaped Pendant
A pendant with a fang motif. Activated by biting the top of the pendant.
Chisei
Dragon Necklace
A pendant necklace with a dragon motif. Activated by kissing.
Haruomi
Dragon Ring
A ring with a dragon motif. Activated by kissing.
Shogo
Chained Pinky Ring
A pinky ring with a butterfly motif and a chain that extends from it. Activated by kissing.
Toma
Convenient Mirror
A compact-size hand mirror. Activated by kissing the mirror.
Aoi
Unstoppable Wristwatch
A watch with a butterfly motif. Activated by kissing the face of the clock as though in prayer.
Kantaro
Melancholic Smartphone Case
A protective smartphone case. Activated by kissing.
Dongha
Majestic Cane
A walking stick with a swallow motif. Activated by kissing.
Chungsung
Loyalty Ring
A ring with a swallow motif, representing loyalty to the Yeon family. Activated by kissing.
Kei
Innocent Bangle
A bangle bracelet with a simple design. Activated by kissing.
Itsuki
Geometric Square Tattoo
A tattoo inked on the back of his right hand and wrist. Activated by kissing the back of his hand.
Rokuta
Goat's-Head Piercing Ring
Surface body piercing with a goat motif; worn on the middle finger of his left hand. Activated by kissing.
Yuto
Brutal Baton
A police baton. Activated by licking.
Ryoga
Savage Grills
The grills on his canine teeth. Activated by licking.
Shion
Lonesome Nail Ring
A nail ring with a scale motif. Activated by licking.
Kenta
Chain Collar
The chain attached to his collar. Activated by licking.
Characters By Height
Height
Character(s)
157cm (~5'2")
Dongha
160cm (~5'3")
Kantaro
162cm (~5'4")
Reo
163cm (~5'4")
Nayuta
165cm (~5'5")
Kanata*
166cm (~5'5")
Shiki
170cm (~5'7")
Satsuki*, Aoi, Yuto
172cm (~5'8")
Kenta
???**cm (~5'8")
Ryu
175cm (~5'9")
Anne, Iori, Itsuki
176cm (~5'9")
Yohei
177cm (~5'10")
Kei
178cm (~5'10")
Allen, Chisei, Toma
180cm (~5'11")
Haruomi, Shogo, Shion
182cm (~6'0")
Rokuta
183cm (~6'0")
Saimon
185cm (~6'1")
Hajun, Chungsung
188cm (~6'2")
Zen
193cm (~6'4")
Hokusai
195cm (~6'5")
Ryoga
Heights in imperial units are (hopefully obviously) approximate.
*Publicly, implied to be an exaggeration for the sake of ego.
**A piece of flavor text at a popup shop exhibition in 2022 indicates Ryu is 173cm tall, hence his placement here.
Characters By Blood Type
Characters in Japanese media often have their blood type listed; the belief that blood type and personality are correlated is a popular superstition, not unlike star signs. This is generally hokum and doesn't really mean anything (and uh, is often touted by eugenicists, so that's not great), but for the sake of curiosity, I've grouped them up here!
Fun(?) fact: most Japanese people's blood (an estimated 99% of the population) is Rh+, meaning that there is generally no distinguishing between a positive and negative blood type, so all characters can be assumed to be (type)+.