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1The characters of ''Manga/HekikaiNoAiON'' include:
2----
3
4!!Seine Miyazaki
5[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/Seine_7390.jpg]]
6
7Seine Miyazaki 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 chapter, 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, Simon'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 inability to swim.
8----
9
10* AbusiveParents: [[spoiler:Her second father abused and traumatised her to the the point she is unable to swim.]]
11%%* ActionGirl
12%%* AdventuresInComaland
13%%* TheAgeless
14* AnimalMotifs: Cats. So much that she portrayed as a CatGirl in an omake.
15* BerserkButton: Shizuki and Yuzuki. Also anything mermaid-related.
16* BrokenBird: [[spoiler:The first 4 years of her life were horrible, her ParentalSubstitute was killed in front of her and she's seen lots of people she cared about dying as well]].
17* {{Delinquent}}: She's seen as this by Tsukasa.
18* EveryoneCallsHimBarkeep: Seine is frequently called "witch" instead of her real name.
19* {{Expy}}: Of ''Manga/{{Karin}}'', though only in appearance.
20%%* GoodThingYouCanHeal
21* HugeGuyTinyGirl: With 19-year-old Tatsuya.
22%%* IAmAMonster
23* IGaveMyWord: When she finds someone who [[PleaseDontLeaveMe asks her to stay by his/her side]], she stays until they die, tell her to leave, or obstruct her revenge, [[spoiler:because she used to be completely alone, too]].
24%%* ImmortalLifeIsCheap
25%%* {{Immortality}}
26* ImportantHaircut: She used to have long hair, but she cut it when she ultimately decided to follow the YouKilledMyFather path.
27* InnocentFanserviceGirl: More like "Indifferent Fanservice Girl".
28%%* IWorkAlone
29* LeParkour: With Aion's help. Tatsuya even compares her to a roof-jumping cat.
30%%* {{Neet}}: After the TimeSkip.
31* NotGrowingUpSucks: Seine's had to go through high school many, many times to maintain cover. She even complains about it while talking about her nth school festival.
32%%* NotSoStoic
33%%* OrdinaryHighSchoolStudent: Subverted.
34* ParentalAbandonment: [[spoiler:She doesn't know anything about her biological parents]].
35%%* PowerTattoo
36%%* PrettyFreeloader
37* Really700YearsOld: She is 300 years old.
38%%* RelationshipUpgrade: [[spoiler:With Tatsuya]].
39%%* ResurrectiveImmortality
40* SugarAndIcePersonality: Later, she evolved to a {{Tsundere}} towards Tatsuya.
41* SuperDrowningSkills: Seine can't swim. Even in a kid's pool with water-wings, she sinks like a rock. And she fights the people of the sea. The irony.
42* TheNoseKnows: She claims infected humans have a different smell than normal humans, and she's learned how to distinguish it over time.
43%%* TogetherInDeath
44* WhenSheSmiles: Just look at her. [[DoggedNiceGuy Tatsuya]] is out of breath.
45* YouKilledMyFather: Her {{Revenge}} motivation.
46
47!!Tatsuya Tsugawa
48[[quoteright:264:https://static.tvtropes.org/pmwiki/pub/images/Tatsuya_1012.jpg]]
49
50After the death of his parents in a car accident, Tatsuya tries to fulfill his father's last wish of becoming a "high caliber" man. After "saving" Seine from bullying, he insists on trying to help her, even after finding out her real goals. 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 cook, 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.
51
52[[TimeSkip Four years later]], he starts going to University at the city.
53----
54
55* AccidentalPervert: Luckily for him, the girls are an IceQueen and a FishOutOfWater.
56%%* AlliterativeName
57* BecauseYouWereNiceToMe: After Seine [[PetTheDog encouraged him]] by saying he can become a "high caliber" man, he fell for her and wanted to be acknowledged by her.
58* TheBigDamnKiss: [[spoiler:Finally the guy gathers the courage to give one to Seine in chapter 39]].
59* BreakTheCutie: Let's just say chapter 15 wasn't very nice to him. He gets better at the end of chapter 16 with Seine's help.
60%%* CrossdressingVoices
61%%* CurtainsMatchTheWindow
62* DoggedNiceGuy: He displays a low-key yearning for Seine. He tries to be her LivingEmotionalCrutch, always remembering her that he'll always be there for her, worries about her dangerous methods of hunting, and tries to make her smile at least. She calmly said to him she doesn't correspond his feeling but he said he doesn't care and keeps trying, even after [[TimeSkip 4 years.]] [[spoiler: Finally, in Chapter 39, he spits it out giving her a [[TheBigDamnKiss Big Damn]] ForcefulKiss]].
63* DraggedIntoDrag: Forced to dress up as a {{meido}} as part of his class's cafe staff. And the girls rejoiced, [[AttractiveBentGender but no one can deny he looks so cute as a female]].
64* HeroicBSOD: At his parents' funeral. [[JustifiedTrope Understandable]].
65* HeroicWillpower: Why he didn't [[spoiler:kill Seine even after being infected]].
66%%* HugeGuyTinyGirl: With Seine.
67* IGotBigger: Though 19-years-old Tatsuya looks quite the same as 16-years-old Tat-chan, just bigger.
68* InTouchWithHisFeminineSide: He tries to take care of his house once since his uncle left--make meals, clean, and so on. Minato jokes that he acts like a wife.
69%%* JourneyToTheCenterOfTheMind
70* KidWithTheLeash: He's the only one able to control and stop Seine when she's on a rampage. [[spoiler:Also, he could be this to Sheila too]].
71* LethalChef: As Shizuki discovered. Only Seine is not bothered by his cooking.
72* LivingEmotionalCrutch: He became more or less this to Seine after [[spoiler:his JourneyToTheCenterOfTheMind of Seine and learning why she's so broken]]. He promised her to always be there for her and, as a bonus, he reminds her of a past friend.
73* LonelyRichKid: Until Seine promises him to stay.
74* NonActionGuy: Though he's helpful in other ways.
75* ObliviousToLove: He can't realize Nagisa has a crush on him since they were around 12 until Minato told it to his face and was horrified that even Seine could read her behavior better than him in only one month.
76%%* OrdinaryHighSchoolStudent
77* ParentalAbandonment: [[MyParentsAreDead His parents died]] a week before the start of the story.
78* SayMyName: "MIYAZAKI-SAN!"
79* SecretKeeper: He promises to keep the secret that Sheila is actually a mermaid after doing a PinkySwear with her.
80* SingleTargetSexuality: Seine.
81* TogetherInDeath: [[spoiler:With Seine]].
82* YouAreNotAlone: To Seine.
83
84!!Nagisa Yoshiyuki
85[[quoteright:264:https://static.tvtropes.org/pmwiki/pub/images/Nagisa_7011.jpg]]
86
87Nagisa 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 whenever she is in Tatsuya's house. So she simply stays away from him, even though she loves him.
88
89[[TimeSkip Four years later]] she works as [[FanserviceWithASmile a waitress]] in a cafe.
90----
91
92* BelligerentSexualTension: With Minato.
93* BerserkerTears: Cried these while [[BrainwashedAndCrazy choking Seine to death]].
94* CanNotSpitItOut: She just can't say: "Tatsuya, I love you."
95* ControlFreak: Mild example. Since she is in charge or her house, she's very strict even with her [[BumblingDad father]].
96* DamselInDistress: [[spoiler:When she was infected by Mushis]].
97* {{Expy}}: Of Maki from ''Manga/{{Karin}}''. They have a similar appearance to each other and are childhood friends to the main character. Nagisa's BelligerentSexualTension with Minato also parallels to Maki and Yuuji's SlapSlapKiss relationship.
98* ExpositoryHairstyleChange: After the TimeSkip, she's seen with a bob instead of her long side ponytail.
99* FanserviceWithASmile: She works as a waitress in a cafe.
100* FirstNameBasis: With Minato. She also used to have this with Tatsuya, but since everybody thought she was [[{{Golddigger}} taking advantage of him for being rich]] and her allergies kicked in, she's starting to keep her distance, they get back to the first-name basis after [[spoiler:the Mushi incident]].
101* HeroicSelfDeprecation: She thinks she's a bad, selfish person, unworthy of MessianicArchetype Tatsuya. She gets better.
102%%* MissingMom
103%%* MoodSwinger
104* MoreThanMindControl: [[spoiler:When she was infected by Mushis]], they used her jealousy of Seine and her fear that Tatsuya knows she wanted his dog dead to break her will.
105* PlotAllergy: She's allergic to dog hair. After Tatsuya decided to adopt Croquett, she started to avoid going at his house so he doesn't see her sneezing. All this make her hate the dog that would become Tatsuya's lasting family, droving her into more self-hate and making easier [[spoiler:her infection]].
106* SingleWomanSeeksGoodMan: She fell for Tatsuya when he defended her from accusations of being a gold digger.
107* UnluckyChildhoodFriend
108
109!! Minato Higuchi
110[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/Minato_5652.jpg]]
111
112Tatsuya's friend and Nagisa's neighbor. More worldly and savvy than his friend, he notices that Seine is not a normal girl.
113
114* BelligerentSexualTension: With Nagisa.
115* TheConfidant: He's the only who Nagisa can talk with about her crush on Tatsuya and her allergy to dog hair.
116%%* DisappearedDad
117%%* {{Expy}}: Of [[Manga/{{Karin}} Ren]].
118%%* {{Foil}}: To Tatsuya.
119%%* KeepingSecretsSucks
120%%* LongHairedPrettyBoy: After TimeSkip.
121%%* MuggleBestFriend
122%%* PermaStubble: After TimeSkip.
123* SensitiveGuyAndManlyMan: Manly man to Tatsuya's sensitive guy.
124* TallDarkAndHandsome: With some degree of TallDarkAndSnarky
125* ThoseTwoGuys: With Nagisa.
126
127!! Minagi Shyyuusuke
128[[quoteright:189:https://static.tvtropes.org/pmwiki/pub/images/Minagi_3678.jpg]]
129
130Tatsuya's little second cousin.
131
132* BoundAndGagged: Her own parents did this to her when they were BrainwashedAndCrazy.
133* BreakTheCutie: Chapter 3 and 4 did this to her, but thanks to LaserGuidedAmnesia as ResetButton, it was like this never happened.
134* CanineCompanion: After Croquett helped her, she started to have a soft spot for him.
135%%* CheerfulChild
136* ChildrenAreInnocent:...but she can tell that Tatsuya's house is full of perverts.
137* CoolBigSis: She sees Seine as this after TimeSkip.
138%%* CurtainsMatchTheWindow
139%%* TheCutie
140%%* GirlishPigtails
141* HairColorDissonance: Is she a brunette, dark blonde, or even a strawberry blonde?
142* HilariouslyAbusiveChildhood: Her father wants to pay off his debts by [[KissingCousins marrying her to Tatsuya]] and getting at Tatsuya's inheritance; she declares [[ParentalNeglect her parents barely pay attention to her]] and just worry about money, and [[ParentsAsPeople when they try to care, they just shame her]]. All PlayedForLaughs.
143%%* IGotBigger
144* MsExposition: She explained the formation of fog, which was a plot point in chapter 31.
145* OutOfFocus: {{Lampshaded}} in chapter 25. [[spoiler:This may change now that she lives in Tatsuya's house]].
146%% * ShipperOnDeck: To Seine x Tatsuya.
147* SpoiledBrat: She grows out of it after [[spoiler:the Mushi incident with her parents]].
148%%* ThirdPersonPerson
149* TokenMiniMoe: And first victim of Yuzuki's ForcefulKiss.[[spoiler:..at least this time]].
150* WiseBeyondHerYears: She's the most reliable one in [[spoiler:Tatsuya's house]].
151--> '''Minagi:''' With [[HilariouslyAbusiveChildhood that kind of parents]] around you, you'll grow up to be reliable even if you don't want to.
152* YaoiFangirl: She may be joking, though.
153
154!! Tsukasa Kaimaki
155[[quoteright:163:https://static.tvtropes.org/pmwiki/pub/images/TsukasaHnA_7254.jpg]]
156
157A protege of Tatsuya's father and Tsugawa's family lawyer in charge of Tatsuya's money until he gets old enough. He and Tatsuya have a fraternal relationship, even though they are not blood relatives. He cares and looks after Tatsuya but his job as a lawyer prevents him from being able to be close to him.
158
159* BigBrotherMentor: To Tatsuya; who calls him "Tsukasa-[[UsefulNotes/JapaneseSiblingTerminology niisan]]".
160* CloserToEarth: He says to Tatsuya that he can't go around picking girls to live in his house. And he's right.
161%%* HelloAttorney
162* LikeBrotherAndSister: Non-romantic way. He has no blood tie with Tatsuya or Minagi, but he's a member of the family.
163%% * LikesOlderWomen: [[spoiler:He had a crush on Tatsuya's mother, Umi, when he was a teenager]].
164* LovingAShadow: [[spoiler:He seems to have a crush on Sheila because she looks like a carbon copy of Umi]].
165* MenDontCry: {{Averted}}. He breaks down every time Tatsuya acts as a delinquent on his eyes.
166%%* {{Muggle}}
167* NoIndoorVoice: Most of his dialogue is yelling at Seine or Tatsuya, usually while crying.
168%% * NoRespectGuy: To Seine.
169* OlderThanHeLooks: He looks like in his early 20, but it's 27. After the TimeSkip, he looks practically the same but now he's ''31''.
170* ScaryShinyGlasses: When pissed off.
171%%* SharpDressedMan
172%%* TallDarkAndHandsome
173* TeamChef: After TimeSkip. He became this after moving to Tatsuya's house [[spoiler:since Yuzuki was PutOnABus along with Shizuki]].
174
175!!Shizuki
176[[quoteright:218:https://static.tvtropes.org/pmwiki/pub/images/Shizuki_6428.jpg]]
177
178Shizuki 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 (but then, he ''is'' a LethalChef). She has an immortal body and has lived for centuries. She gave immortal bodies to Seine and Simon. Her former name was "Pistis Sophia" but she changed because it was "stupid". She is a Oyaji-con (she is attracted to mature, handsome men).
179
180----
181
182%% * AffectionateGestureToTheHead: To Yuzuki. Also sometimes to Seine, just to annoy her.
183* AnimalEyeSpy: Shizuki can see through the eyes of Chibi Piyo-piyo. [[spoiler:and since Croquet eat Chibi Piyo-piyo, she can see what Croquette sees]].
184%% * TheBusCameBack: [[In chapter 40]].
185* ButNowIMustGo: [[spoiler:Now that Seine accomplished her revenge for killing Ariel, she and Yuzuki leave her at Shiomigahama to search for a new person to hunt mermaids]].
186%% * CovertPervert: She's an "Oyaji-con"; she likes [[SilverFox old, handsome men]]
187%% * GodInHumanForm
188* IdenticalTwinIDTag: Shizuki is the one with the [[LittleBlackDress Long Black Dress]].
189%%* IcyBlueEyes
190%%* ImpossibleHourglassFigure
191%%* ManipulativeBitch
192* MeaningfulName: Shizuki means "calm moon". [[spoiler:Also, her former name. "Pistis Sophia" is the female divinity of gnosticism that means "Faithful Wisdom"]].
193%%* MissionControl
194* {{Neet}}: She does absolutely nothing but eat and sleep. Partially justified as she's ill.
195%%* NoblewomansLaugh
196%%* OjouRinglets
197%% * OneeSama: to Yuzuki.
198%% * PointyEars: Probably due to being a demon.
199%% * PolarOppositeTwins: With Yuzuki.
200%%* PrettyFreeloader
201%%* PutOnABus
202%%* Really700YearsOld
203%% * ShowSomeLeg: In Volume 4's index.
204%%* TeaIsClassy
205%% * ThemeTwinNaming: With Yuzuki.
206%%* TsurimeEyes
207
208!!Yuzuki
209[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/Yuzuki_8668.jpg]]
210
211Yuzuki is Shizuki's younger sister. She is the polar opposite of her sister: she has superhuman strength, is diligent and a good cook, but is a little dumb. She is good-hearted and carries out her Onee-sama's orders. She also has an immortal body and has lived for centuries. She is a ComedicLolicon (she gets excited by children, especially girls) to the point of kissing every child she meets on the mouth (occasionally ''with tongue'') upon first sight.
212----
213
214* ApologeticAttacker: When "attacking" Seine at her sister's demand.
215* BigDamnHeroes: She saves an exhausted Seine from Bella's attack.
216%% * BridalCarry: Sometimes she carries Shizuki around like this.
217* ButNowIMustGo: [[spoiler:Now that Seine accomplished her revenge for killing Ariel, she and Shizuki leave her at Shiomigahama to search for a new person to hunt mermaids]].
218%%* CombatStilettos
219* TheDitz: Shizuki even said that Yuzuki has the mind of a kindergartener.
220%%* DumbMuscle
221%% * ExtremeDoormat: To her sister.
222%% * ForcefulKiss: The way she expresses her love for little girls. '''Any''' little girl.
223%%* GodInHumanForm
224* IdenticalTwinIDTag: She's the one with the [[LittleBlackDress little black dress of power]].
225%%* ImpossibleHourglassFigure
226* ImTakingHerHomeWithMe: Yuzuki seems to have this sort of reaction to every small, cute child she sees.
227%%* InnocentBlueEyes
228%%* LightningBruiser
229* MeaningfulName: Yuzuki means "kind moon".
230* {{Meido}}: She works as a maid in Tatsuya's house.
231%% * MsFanservice:
232%% ** Bikini in the BeachEpisode.
233%% ** Her {{Meido}} outfit at "work".
234* NoSenseOfDirection: She gets lost inside a school, mostly because of her ditziness.
235%%* TheOjou
236%% * PolarOppositeTwins: With Shizuki.
237%% * PointyEars: Probably due to being a demon.
238%% * PrettyFreeloader: But at least she cleans and cooks.
239%%* Really700YearsOld
240%%* TaremeEyes
241%%* TeamChef
242* ThemeTwinNaming: With Shizuki.
243
244!!Sheila
245[[quoteright:230:https://static.tvtropes.org/pmwiki/pub/images/Sheila_9754.jpg]]
246
247She was introduced as a new transfer student, and Tatsuya is given the assignment of teaching her sign language. [[spoiler:The youngest of the mermaids, she is despised by all her older sisters except for Ariel. Seine thought she had killed her some 300 years before, but Ariel restored her body almost entirely, leaving her badly scarred about the neck and unable to talk, but with the ability to change herself to have legs and walk about on land. Her true goal is infect a lot of people to order to take revenge on Seine for leaving her without her voice.]] She falls in love with Tatsuya.
248
249[[TimeSkip Four years later]] she meets Tatsuya as he convinces her [[spoiler:to stop thinking of revenge]] but [[spoiler:she's discovered by two of her sisters and leaves the sea in fear. Tatsuya takes her into his house even though Seine is there; Seine allows her to live, but as a hostage against her sisters]]. She seems very jealous of Seine for being the target of Tatsuya's affections.
250----
251
252* AntiVillain: [[spoiler:[[SlidingScaleOfAntiVillains Type 2]]]], after 4 years, [[spoiler:she evolved to [[SlidingScaleOfAntiVillains Type 4]]]] since she still hates Seine.
253%%* AnguishedDeclarationOfLove: And with HandSignals.
254%%* BackFromTheDead
255* BecauseYouWereNiceToMe: She ordered [[spoiler: the infected humans]] to [[YouWillBeSpared avoid hurting Tatsuya]] because he was nice to her.
256* BlessedWithSuck: [[spoiler: She has the ability to turn her tail into legs and move around on land, but can't go far from the ocean]].
257%%* CameBackWrong
258%%* CuteMute
259* FishOutOfWater: [[spoiler:Quite literally, since she starts living in Tatsuya's house]].
260* ForcefulKiss: [[spoiler:The way she infects humans on land]], At the end of chapter 38, [[spoiler:she gives one of these to Tatsuya]].
261* GirlinessUpgrade: After becoming a new [[spoiler:PrettyFreeloader]], Nagisa put her intro a cute dress.
262%%* GirlishPigtails: At school.
263* GoingCommando: She doesn't seem know what a bra is or what it's for.
264* HeroicRROD: [[spoiler:If she stays on land too long, Sheila's body will start to painfully rot, as it's a human corpse from neck down. She can only live safely in the sea]].
265* IdenticalStranger: To Tatsuya's mother, Umi. The reasons for this have not yet been revealed.
266%%* ImpossibleHourglassFigure
267%%* InnocentFanserviceGirl
268%% * InSeriesNickname: Shii-chan.
269%% * MoralityPet: To her elder sister.
270* NonHumanSidekick: Anna the sea slug was this for her, aside from being her best friend.
271* OffWithHerHead: [[spoiler:The way Seine killed her 300 years ago]].
272%%* OurMermaidsAreDifferent
273%%* PrettyFreeloader
274%%* ScarsAreForever
275* SchoolUniformsAreTheNewBlack: Sheila is always showed wearing her uniform. [[spoiler:Justified; it seems to be her [[LimitedWardrobe only wardrobe]]]].
276%%* ShrinkingViolet
277* SingleWomanSeeksGoodMan: Sheila fell for Tatsuya because he was the only person aside from Ariel to show her kindness.
278* SproutingEars: Or Sprouting Dog Tail, in her case.
279* TalkingWithSigns: She carries around a notebook wherein she writes what she wants to say. She also learns some HandSignals from Tatsuya.
280* ThrowTheDogABone:
281** [[spoiler:Ariel gave her Enati's lower body after she died so now she's a complete mermaid again]].
282** [[spoiler: After Seine give up Aion, this returned to her and give her back her voice]].
283* TragicKeepsake: She conserved the necklace that Nagisa chose and Tatsuya brought for her [[spoiler: even after returning eternally to the sea]].
284* UnusualEars: [[spoiler:As a mermaid]].
285
286!!Simon Magus
287[[quoteright:162:https://static.tvtropes.org/pmwiki/pub/images/Simon_Magus_9117.jpg]]
288
289Simon 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. [[spoiler:He died eaten by the mermaids.]]
290
291* BecauseYouWereNiceToMe: Seine decided go with him because Simon was nicer to her than her current foster father.
292* BigOlEyebrows: In comparison to the rest of the cast.
293%%* CoolOldGuy
294* CrouchingMoronHiddenBadass: The child raising fanatic was Seine's predecessor at hunting mermaids.
295* DissonantSerenity: Since he's {{immortal|ity}} and knows [[GoodThingYouCanHeal his wounds can't be fatal]], he's always cheerful even in in the face of danger.
296%%* EatenAlive
297* FaceFramedInShadow: Until his formal introduction,
298* ItsNotYouItsMyEnemies: Tried to leave Seine somewhere safe without telling her before he went to fight the mermaids... but Seine went back to him, right in the middle of the fight, and yelling at her to run to safety [[spoiler:[[ShooTheDog distracted him enough that the mermaids were able to attack him and eat him]]]].
299* LikeAGodToMe: Seine quoted this trope word-for-word to describe her admiration and love of Simon.
300%%* OurGhostsAreDifferent
301* ParentalSubstitute: To Seine.
302%%* PosthumousCharacter
303%%* PowerTattoo
304%% * Really700YearsOld: He was 1700 years old.
305%%* ScarfOfAssKicking
306* SilverFox: Let's face it, for a man who look in his 50-something and actually is 1700 years old, Simon look very good. Even Shizuki admited she would totally do him if she could had decided stop his aging a little more lately so he would be older enough of her standard.
307* SpellMyNameWithAnS: Some translations write his name as "Shimon", Shimon being the Japanese pronunciation of Simon.
308
309!! The Mermaids
310They are Seine's prey, in revenge for Simon's death. In-universe, they are the ones who sank Atlantis, Mu, and Port Royal and destroyed Pompeii in order to collect psyche from humans. Up til now, 5 of the 7 mermaids have been introduced. They are Ariel the eldest, Bella the second, Enati the third, Anshu the fourth, and [[spoiler:Sheila the seventh]].
311
312* AffablyEvil: Ariel is less of a {{Jerkass}} than the rest of her sisters and she and Shizuki only had a PassiveAggressiveKombat when they saw each other.
313%% * AmbiguouslyBrown: Ariel.
314%% * AnimeHair: Bella.
315%% * AntiVillain: Ariel, [[SlidingScaleOfAntiVillains type 1]].
316%% * ArtificialLimbs: [[spoiler:Enati]].
317* AsskickingLeadsToLeadership: No matter if you're younger, if you're powerful enough you can take your older sister's place in the ladder. [[spoiler:That precisely is Enati's plan]].
318* AttackOfThe50FootWhatever: Ariel. She's big enough to easily pick up her younger sisters bodily in one hand, and her face alone is taller than Seine.
319%% * BadWithTheBone: Enati [[spoiler:uses Simon's skull to make an illusion of him]].
320%% * BigBad: Among then, Ariel the eldest is the leader.
321* BigSisterBully: All but Ariel pick on their youngest sister.
322* BigSisterWorship:
323** Anshu to Enati, later to [[spoiler:Sheila]] after she get her lower body.
324** Later discovered that the fifth and the sixth have this towards Bella.
325* BreakThemByTalking: Enati and Anshu to [[spoiler:Sheila]].
326* TheBrute: Bella. She's sadistic, ruthless, and loves to cause pain.
327* CollectorOfTheStrange: Anshu likes to collect [[spoiler:human parts]].
328%% * CuteMonsterGirl: All of them (even Ariel), except for Bella.
329* TheDreaded: Bella is feared by all her younger sisters. Ariel, being the eldest and strongest one, is this to Bella.
330%%* EvilGenius: Enati.
331%%* FangsAreEvil
332%%* FemmeFatalons
333%% * GiantWallOfWateryDoom: Their ultimate weapon.
334%%* HellishPupils
335%%* ImAHumanitarian
336%% * JustBetweenYouAndMe: The fight between Seine and Ariel.
337%% * LotusEaterMachine: [[spoiler:Ariel put Seine in one of this]].
338%%* MasterOfIllusion: [[spoiler:Enati]].
339%%* MindControl: Via Mushis.
340%%* OffWithHerHead: [[spoiler:Enati]].
341%%* OurMermaidsAreDifferent
342%%* SiblingRivalry

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