| Age | Character(s) |
| 14 Years Old | Dongha |
| 15 Years Old | Kenta |
| 16 Years Old | Aoi |
| 17 Years Old | Shiki, Reo, Kantaro, Itsuki, Rokuta | 18 Years Old | Meno |
| ?? 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, Noah |
| 24 Years Old | Hokusai |
| 27 Years Old | Zen, Akito |
| 28 Years Old | Yohei, Iori, Chungsung |
| 32 Years Old | Yuto |
| 34 Years Old | Saimon |
| 36 Years Old | Haruomi |
| 28/38 Years Old | Chisei** |
| Date | Character |
| January 1 | Zen |
| January 15 | Itsuki |
| January 31 | Kei |
| February 7 | Chungsung |
| February 14 | Kantaro |
| February 28 | Noah |
| 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 3 | Meno |
| 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 18 | Akito |
| December 24 | Kanata & Nayuta |
| 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. |
| Noah | Unknown | Phantometal TBD. |
| Meno | Unknown | Phantometal TBD. |
| Akito | Unknown | Phantometal TBD. |
| Height | Character(s) |
| 157cm (~5'2") | Dongha |
| 160cm (~5'3") | Kantaro |
| 162cm (~5'4") | Reo |
| 163cm (~5'4") | Nayuta, Meno |
| 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, Noah |
| 180cm (~5'11") | Haruomi, Shogo, Shion |
| 182cm (~6'0") | Rokuta |
| 183cm (~6'0") | Saimon |
| 185cm (~6'1") | Hajun, Chungsung |
| 187cm (~6'1") | Akito |
| 188cm (~6'2") | Zen |
| 193cm (~6'4") | Hokusai |
| 195cm (~6'5") | Ryoga |
| Character | Personal Pronoun | Remarks |
| Allen | Ore | - |
| Hajun | Boku | Usually, but not always, written in katakana (ボク). |
| Anne | Boku | - |
| Saimon | Watashi | - |
| Yohei | Ore | - |
| Ryu | Ryu-kun (refers to himself in the third person) | In certain contexts (ex: Nobody Is Listening), uses rapidly changing personal pronouns. |
| Shiki | Boku | - |
| Kanata | Ore | - |
| Nayuta | Ore | - |
| Iori | Ore | - |
| Zen | Watashi | - |
| Hokusai | Ore | - |
| Satsuki | Ore | - |
| Reo | Boku | - |
| Haruomi | Ore | - |
| Chisei | Ore | - |
| Shogo | Ore | - |
| Toma | Ore | Very occasionally written in katakana (オレ); regularly uses hiragana (おれ) in his ore-ore-ore lines. |
| Aoi | Boku | - |
| Kantaro | Boku | Very occasionally uses hiragana (ぼく) when posting on the "Hanitaro" account. |
| Dongha | Boku | - |
| Chungsung | Watakushi | Also occasionally refers to himself in the third person, usually by full name (Baek Chungsung). |
| Kei | Boku | - |
| Itsuki | Ore | - |
| Rokuta | Ore | Exclusively uses katakana (オレ). |
| Yuto | Watashi / Ore | Personal pronoun dependent on which personality is active. |
| Ryoga | Ore | - |
| Shion | Ore | - |
| Kenta | Ore | - |
| Noah | Ore | - |
| Meno | Atashi | Seems to occasionally refer to herself in the third person as well? Not enough data to be conclusive. |
| Akito | Boku | - |
| Blood Type | Character(s) |
| Type A | Zen, Satsuki, Haruomi, Shogo, Toma, Aoi, Itsuki |
| Type B | Kanata, Nayuta, Reo, Dongha, Ryoga, Noah, Akito |
| Type AB | Allen, Hajun, Shiki, Iori, Hokusai, Chisei, Chungsung, Kei, Yuto, Kenta |
| Type O | Yohei, Kantaro, Rokuta, Shion, Meno |
| ??? | Ryu |
| Group | Main Color | Sub Color |
| BAE | #EF555F | #D3D4D2 |
| The Cat's Whiskers | #005A9F | #AEBAC0 |
| cozmez | #D9B3E0 | #A3DFD7 |
| Akan Yatsura | #FACC53 | #E63556 |
| Buraikan | #A38F3C | #000000 |
| VISTY | #F668B2 | #F4E357 |
| AMPRULE | #006F55 | #B43A81 |
| 1Nm8 | #BDC3C4 | #7AD49B |
| GokuLuck | #F75A18 | #4CB9CD |
| ILLGATOR | #D9B3E0* | #00BFB0* |
| Character | Image Color |
| Allen | #AF3250 |
| Hajun | #C7E5DE |
| Anne | #DC4691 |
| Saimon | #333333 |
| Yohei | #2F479C |
| Ryu | #D2D047 |
| Shiki | #E25B48 |
| Kanata | #46C3C3 |
| Nayuta | #CECECE |
| Iori | #B743A5 |
| Zen | #6DAAAA |
| Hokusai | #9ECD1E |
| Satsuki | #FA821E |
| Reo | #F56E82 |
| Chisei | #CBB300 |
| Haruomi | #A1A3A3 |
| Shogo | #37C3FF |
| Toma | #FFF500 |
| Aoi | #5F3796 |
| Kantaro | #FA9ABF |
| Dongha | #E1F0AA |
| Chungsung | #B9005F |
| Kei | #FFDCDC |
| Itsuki | #99D4DC |
| Rokuta | #FFB599 |
| Yuto | #0078D7 |
| Ryoga | #E60000 |
| Shion | #DFC9CB |
| Kenta | #32B996 |
| Noah | #7C4BCC* |
| Meno | #BAF437* |
| Akito | #D50F72 |