Hekikai no AiON/Characters

The characters of Hekikai no Ai ON include:

Seine Miyazaki
Miyazaki Seine is a 300 year old girl with an immortal body who Tatsuya invites to live in his home; before that she lived in a cardboard box in a park. In the first episode, Seine looks like a masochist because she seems to like being bullied. Actually, she becomes close to people who are infected by "mushis", a kind of parasitic, mind-controlling bugs, in order to hunt them. Her hunting ways go against the kind and pacifist Tatsuya's beliefs. Her motive is to avenge her foster father Shimon's death by killing the people of sea, the mermaids. She controls a black snake called Aion that lives inside her. Her weakness is her inabilty to swim.


 * Action Girl
 * Abusive Parents:
 * Animal Motifs: Cats. So much that she portrayed as a Catgirl in an omake.
 * Berserk Button: Shizuki and Yuzuki. Also anything mermaids relevant.
 * Broken Bird:
 * Delinquent: She's seem as this by Tsukasa
 * Everyone Calls Him Barkeep: Seine is frequently called a witch instead of her real name.
 * Evil Eye: While using Aion
 * Eyes of Gold / Hazel Eyes: Normally
 * Expy: of Karin, appearance only though
 * Girl in A Box: Lived in a cardboard box prior to meeting Tatsuya.
 * Haruka Tomatsu: Her Drama CD VA
 * Huge Guy Tiny Girl: with 19-years-old Tatsuya
 * I Am a Monster
 * I Gave My Word: When she found someone who ask her to stay by his/her side, she stays until the last day
 * Immortal Life Is Cheap: / Good Thing You Can Heal
 * Important Haircut: She used to had a mild example of Rapunzel Hair but she cut it when she ultimately decided follow the You Killed My Father path
 * Innocent Fanservice Girl: or more like "Doesn't care fanservise girl".
 * I Work Alone
 * Kuudere
 * Le Parkour: With Aion's help. Tatsuya even compare her with a jumping roofs's cat
 * NEET: After Time Skip
 * Not Growing Up Sucks: Seine had to hold up being in high school who knows how many times! She even complains about it while talking about her nth school's festival.
 * Not So Stoic
 * Parental Abandonment:
 * Pettanko
 * Power Tattoo
 * Pretty Freeloader
 * Really 300 Years Old
 * Super Drowning Skills: Seine can't swim. Even in a kid's pool with floaters, she sink like a rock; and she fights the people of the sea. The irony.
 * Teens Are Short: her height is 1.46m (4' 7")
 * The Nose Knows: She claims infected humans have a different smell than normal humans and she with the time learned how distinguish it
 * Tomboyish Sidetails
 * When She Smiles: Just look at her. Tatsuya is out of breath
 * You Gotta Have Green Hair
 * You Killed My Father: Her Revenge motivation
 * Zettai Ryouiki: Grade B and sometimes Grade A
 * Zettai Ryouiki: Grade B and sometimes Grade A

Tatsuya Tsugawa
After the death of his parents in a car accident, Tatsuya tries to live to fulfill his father's last wish of becoming a "high caliber" man. After "saving" Seine from bullying, he insist on trying to help her, even after finding out the real goal of Seine. He is kind, optimistic and believes in other people's good side which is sometimes an obstacle in Seine's revenge. He is a bad cooker but somehow Seine is not bothered by his food. He has a crush on Seine and wants to be acknowledged as a "high caliber" man by her.

Four years later he starts going to University at the city.


 * Accidental Pervert: Luckly for him, the girls are an Emotionless Girl and a Fish Out of Water
 * Adorkable
 * Alliterative Name
 * Curtains Match the Window
 * Bishounen: First the cute kid edition, then later the hot guy edition
 * Break the Cutie: Let's just say chapter 15 wasn't very nice to him. He get better at the end of chapter 16 with Seine's help.
 * Dogged Nice Guy: to Seine
 * Dragged Into Drag: forced to dress up as a Meido as part of his class's cafe staff. And the girls rejoiced.
 * In Touch With His Feminine Side: He tries to take care of his house once since his uncles left: make meals, clean and stuff. Minato jokes that he acts like a wife.
 * Lethal Chef: As Shizuki discovered. Only Seine is not bothered by his food
 * Living Emotional Crutch: He became more or less this to Seine after . He promesed her to always be there for her and, as a bonus, he reminds her of a past friend.
 * Kid With the Leash: He's also the only one able to control and stop Seine when she's in a rampage rage.
 * Lonely Rich Kid: until Seine promeses him to stay.
 * Love At First Sight: Probably, upon Seine.
 * Mamiko Noto: His Drama CD VA
 * Cross Dressing Voices
 * Nice Guy: Initially
 * The Messiah: He evolved to this,  but...
 * Stupid Good: Seriously Tatsuya  just because you like them both!?
 * Parental Abandonment: His parents died a week before the start of the history
 * Oblivious to Love
 * One Head Taller -> Huge Guy Tiny Girl: with Seine
 * Secret Keeper
 * Single Target Sexuality: upon Seine
 * Teens Are Short: 1.62m (5' 4") at the age of 16
 * Water Works: He cries a lot
 * You Are Not Alone: to Seine.
 * You Are Not Alone: to Seine.

Nagisa Yoshiyuki
Nagisa is a girl in Tatsuya's class, a long time acquaintance, and would probably like to get closer to Tatsuya, but ever since Tatsuya found a lost puppy (soon to be Crokette) Nagisa has had violent allergic reactions when ever she is in Tatsuya's house. So she simply stays away from him, even though she loves him.

Four years later she works as a waitress in a cafe.


 * Cannot Spit It Out: She just can't say: "Tatsuya, I Love You"
 * Control Freak: Mild example. Since she is in charge or her house, she's very stric even with her father
 * Damsel in Distress:
 * Expy: Of Maki from Karin
 * Eyes of Gold
 * First Name Basis: With Minato. She also uses to had this with Tatsuya, but since everybody thought she was taking advantage of him for being rich and her allergies, she's starting to keep her distance.
 * They get back to the first name basis after
 * Hollywood Pudgy: She apparently consideres herself fat and she had taken summer diets that ultimately fail.
 * Missing Mom
 * Mood Swinger
 * More Than Mind Control:  they use her jealousy to Seine and her fear that Tatsuya knows she wanted his dog dead to break her will
 * Single Woman Seeks Good Man: She fell for Tatsuya when he defended her from acussations of being a golddigger.
 * Tomboyish Ponytail
 * Unlucky Childhood Friend
 * Vitriolic Best Buds / Ship Tease / Belligerent Sexual Tension: with Minato
 * You Gotta Have Purple Hair

Shizuki
Shizuki is the older sister of the "Akuma Twins". Being the older, she is sarcastic, lazy and smart but she has a weak body (She can get sick and tired easily, she cannot swim in pools because of the chlorine and Tatsuya's food almost killed her). She has an immortal body and has lived for centuries. She gave immortal bodies to Seine and Shimon. Her former name was "Pistis Sophia" but she changed because it was "stupid". She is a Oyaji-con (she is attracted to "handsome" grown up men).


 * Affectionate Gesture to The Head: To Yuzuki. Also sometimes to Seine just to annoy her.
 * Covert Pervert: she's an "Oyaji-con", she likes old, handsome men
 * Different As Night and Day: with Yuzuki
 * Identical Twin ID Tag: Shizuki is the one with the Long Black Dress
 * Icy Blue Eyes
 * Ill Girl: Her body is so weak that she can't swin in pools because of the chlorine, gets tired easily and Tatsuya's food almost killed her. Luckly she's immortal.
 * Manipulative Bitch
 * Meaningful Name: or ex name whatsoever. "Pistis Sophia" is the female divinity of gnosticism or an important Gnostic text that means "Faithful Wisdom"
 * Shizuki means "Calm moon"
 * Mission Control
 * Multicolored Hair: Black with blonde bangs
 * NEET: she does absolutlly nothing but eat and sleep. Justified for being an Ill Girl
 * Noblewomans Laugh
 * Onee Sama: to Yuzuki.
 * Pointy Ears
 * Pretty Freeloader
 * Princess Curls
 * Really 700 Years Old
 * Show Some Leg: in Volumen 4's index
 * Spot of Tea
 * Theme Twin Naming: With Yuzuki
 * Tsurime Eyes
 * Tsurime Eyes

Yuzuki
Yuzuki is Shizuki's younger sister. She is the opposite side of her sister: her body has superhuman strength, she is diligent and a good cooker but is a little dumb. She is good hearted and satisfies her Onee-sama's orders. She also has an immortal body and has lived for centuries. She is a Lolicon (she get excited by children, especially girls) to the point to kissing every children on their mouth upon just seeing them.


 * Boobs of Steel: the physically strongest character in the series and one of the bustiers
 * Bridal Carry: Sometimes she carries Shizuki around like this
 * Combat Stilettos
 * The Ditz: Shizuki even said that Yuzuki is just a kindergarden's girl in her mind
 * Different As Night and Day: with Shizuki
 * Dumb Muscle
 * Extreme Doormat / The Caretaker: to her sister
 * Forceful Kiss: the way she express her love for little girls. Any little girl
 * Identical Twin ID Tag: She's the one with the Little Black Dress Of Power
 * Innocent Blue Eyes
 * Lolicon: Played for Laughs and Les Yay
 * Meaningful Name: Yuzuki means "Kind moon"
 * Meido: She works as a maid in Tatsuya's house
 * Multicolored Hair: Black with blonde bangs
 * No Sense of Direction: She gets lost inside a school; mostly because of her ditzness and the insides of the school are too complex to her
 * Pointy Ears
 * Pretty Freeloader: But at least, she cleans and cook
 * Princess Curls
 * Really 700 Years Old
 * Supreme Chef / Team Chef
 * Tareme Eyes
 * Theme Twin Naming: With Shizuki.
 * Theme Twin Naming: With Shizuki.

Sheila
She was introduced as a new transfer student; and Tatsuya is given the assignment of teaching her sign language. She falls in love with Tatsuya.

Four years later she stills meets Tatsuya as he promeses her for  but. She seems very jealous of Seine for being target of Tatsuya's affections.


 * After 4 years,  since she still hate Seine.
 * Because You Were Nice to Me: Sheila fell for Tatsuya because he was the only aside Ariel to show her kindness.
 * Big Breasts Big Deal: Type 5
 * Blue Eyes
 * Cry Cute / Inelegant Blubbering: She does one or another
 * Cute Mute
 * Fish Out of Water:
 * Forceful Kiss:
 * Girlish Pigtails: At school.
 * Going Commando / Vapor Wear: She seem to doesn't know what a bra is or for what is used.
 * Heroic RROD:
 * Identical Stranger: with Tatsuya's mother, who happens to be called Umi. The reasons of this have not being revelated yet.
 * Innocent Fanservice Girl
 * In Series Nickname: Shii-chan
 * Non Human Sidekick: Anna the sea slug was this for her, aside her only best friend
 * Rapunzel Hair
 * Scars Are Forever
 * School Uniforms Are the New Black: Sheila is always showed wearing her uniform
 * Single Woman Seeks Good Man: See Because You Were Nice to Me above.
 * Sprouting Ears: or Sprouting Dog Tail in her case
 * Talking With Signs: She carries around a notebook where she writes what she wants to say; also, she learns some Hand Signals from Tatsuya
 * The Woobie: All her sister but Ariel are total Jerkass towards her
 * White Haired Pretty Girl / Shy Blue Haired Girl
 * Single Woman Seeks Good Man: See Because You Were Nice to Me above.
 * Sprouting Ears: or Sprouting Dog Tail in her case
 * Talking With Signs: She carries around a notebook where she writes what she wants to say; also, she learns some Hand Signals from Tatsuya
 * The Woobie: All her sister but Ariel are total Jerkass towards her
 * White Haired Pretty Girl / Shy Blue Haired Girl

Simon Magus
Simon was Seine's third foster father and the one person who showed her kindness when she was young. He was known as a magician in his time and was also known to be 1700 years old (about 300 years ago in present time of the story). He bore the "Aion" mark, just like Seine does at the present time, but he had it across the right shoulder, and was able to use Aion's power for his own, unknown, reasons.


 * Badass Grandpa
 * Because You Were Nice to Me: Seine decided go with him because Simon was nicer to her than her current foster father
 * Big Ol Eyebrows: In comparison to the rest of the cast
 * Cool Old Guy
 * Crouching Moron Hidden Badass: The child raising fanatic was Seine predecessor at hunting mermaids.
 * Dissonant Serenity: Since he's Immortal and knows his wounds can't be fatal, he's always cheerful even in front of danger
 * Face Framed in Shadow: Until his formal introduction
 * Hazel Eyes
 * Parental Substitute: to Seine
 * Posthumous Character
 * Power Tattoo
 * Really 1700 Years Old
 * Scarf of Asskicking
 * Spell My Name With an S: Some translations write his name as "Shimon", being Shimon the japanese pronunciation of Simon.
 * Spell My Name With an S: Some translations write his name as "Shimon", being Shimon the japanese pronunciation of Simon.