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Blood Stain Child is a Japanese five-piece VisualKei heavy metal band formed in Osaka in the year 2000. Originally a MelodicDeathMetal band with heavy SymphonicMetal stylings and SynthPop influences, they have since opted for a musical style that combines MelodicDeathMetal, IndustrialMetal and various styles of ElectronicMusic including trance, techno and JapanesePopMusic. On 2016, they formed a new indie label called Earth Nation Records, after they were signed to Pony Canyon (until 2011) and Lantis (until 2014) in Japan. While they haven't found any mainstream success, the band has had continued success in Japan and has performed in many events and conventions all over the world.

Despite their success, the band has had several lineup changes over the course of their musical career, with only one of the band's original lineup still active.

It is arguable that they are part of the VisualKei movement as they have not explicitly referred to themselves as such, but they have used visuals and costuming similar to many established Visual bands, with the remaining members of the original lineup being the most Visual members of the band. All the band's current and former members have had their start in or have worked with various independent Visual Kei bands.

!!Members (All members use StageNames)
!!! Current Lineup:
* Sadew – lead vocals (2007–2010; 2018–present)
* Ryu – lead guitar, synth guitar (1999, 2000–present)
* G.S.R – rhythm guitar, synth guitar (2007–present)
* Yakky – bass (2016–present)
* Yasu – drums (2018–present)

!!! Former Members
* Masato – rhythm guitar, vocals (1999)
* Daiki – rhythm guitar, synth guitar (1999–2005)
* Shiromasa – rhythm guitar, synth guitar (2005–2007)
* Violator – drums, percussion (1999–2010)
* [[Music/SeasonOfGhosts Sophia]] – vocals (2010–2012)
* Makoto – DJ/VJ (2013–2014)
* Ryo – bass, screamed vocals (1999–2016)
* Kiki – clean and screamed vocals (2012–2016)
* Aki – keyboards, synthesizer, programming, backing vocals (1999–2016)
* Saika – lead vocals (2016–2018)
* Gami – drums, percussion (2010–2018)

!!Discography
* ''Silence of Northern Hell'' (2002)
* ''Mystic Your Heart'' (2003)
* ''Idolator'' (2005)
* ''Mozaiq'' (2007)
* ''Epsilon'' (2011)
* ''Last Stardust'' (single) (2014)
* ''NEXUS'' (single) (2016)
* ''Tri Odyssey'' (EP) (2017)
* ''The Legend'' (compilation) (2018)
* ''Del-Sol'' (single) (2019)
* ''AMATERAS'' (2019)
* ''2045'' (single) (2021)
* ''CYBERIA''/''METALIA'' (2024)

!Blood Stain Child provides examples of
* AlternativeMetal: Has shades of this from ''Idolator'' onward.
* AmbiguousGender: Many fans would say Ryu, but DJ Makoto fits this trope to a T.
* BandOfRelatives[=/=]SiblingTeam: Ryu, the lead guitarist, is the brother of Ryo, the LeadBassist.
* BeethovenWasAnAlienSpy: Sophia's image is that of an "alien loli".
* BerserkButton: Sophia dislikes being called by the [[AffectionateNickname nickname]] "Sophie".
* CanonDiscontinuity: Their first two albums, ''Silence of Northern Hell'' and ''Mystic Your Heart'' have now been largely overlooked by the band and its fanbase.
** Seems to no longer be the case as the band would later release ''The Legend'', a compilation with several re-recordings of songs in their discography, including material from the first two albums.
* CarefulWithThatAxe: The band's {{harsh vocal|s}}ists have done particularly brutal examples throughout their career, most notably the opening screams for "Freedom" from ''Mozaiq'' and "Sirius VI" from ''Epsilon''.
* CosplayOtakuGirl: Ryu, a male example. Sophia too...
* CutenessProximity: Ryu likes playing with cats.
* DistinctDoubleAlbum: ''CYBERIA'' and ''METALIA'' -- the former will be done in the band's usual brand of trance metal and the latter's an expansion of the symphonic stylings that made a comeback on ''AMATERAS'' and the ''2045'' single.
* DudeLooksLikeALady: Ryu is rather famous in the Visual scene for being one of the most convincing crossdressers in Visual Kei. DJ Makoto also appears very waif-ish as well.
* {{Expy}}: Frontman Sadew is a near-carbon copy of Music/InFlames' Anders Friden; both in terms of appearance and vocal timbre. He even grew long, thick dreadlocks and a beard during one of the band's most Visual phases. Recently, he too, [[ImportantHaircut cut off his dreadlocks]].
* GenreBusting[=/=]GenreRoulette: Scroll back up and see the genres that influenced the band's musical style. Song to song, they can differ between any combination of these genres.
* GenreMashup: They describe themselves as playing "hybrid metal trance". They also draw inspiration from IndustrialMetal and the harder, more abrasive end of MelodicDeathMetal. They even went as far as having Ettore Rigotti of Disarmonia Mundi (an Italian melodeath/industrial metal band) produce ''Epsilon'', just because they were aiming for a very specific sound.
* GenreShift: To "Hybrid Metal Trance" from ''Idolator'' onward.
* GratuitousEnglish: Early releases suffered from this and WordSaladLyrics. Their English has gotten noticeably better from ''Idolator'' onward.
* HairTodayGoneTomorrow: Sadew lost his signature dreads by the time he rejoined the band.
* IAmTheBand: Ryu has been with the band since their 1999 debut.
* IncrediblyLongNote: Kiki has become rather well-known for her long, wailing screams.
* LeadBassist: Ryo, a type B and C, is among the most well-known members of the band, being one of the founding members and one half of the VocalTagTeam (the other half being Sophia from 2010-2012 and more recently, Kiki).
* LongHairedPrettyBoy: Ryo and Ryu.
* MelodicDeathMetal: The pioneers of this musical style in VisualKei.
* MetalScream: Ryo and Kiki are Type 3 screamers.
* NewSoundAlbum: ''Idolator'', with its trance and J-pop elements. ''Epsilon'' reintroduced the MelodicDeathMetal stylings of the older albums but also included IndustrialMetal influences a la Music/TheGazette and elements of ThrashMetal courtesy of Gami from the now-defunct VisualKei DeathMetal band Youthquake. ''AMATERAS'' re-adds the symphonic influences that the band eschewed on ''Idolator'' to their modern style.
* {{Otaku}}:
** Ryu loves UsefulNotes/LolitaFashion, anime (especially ''Franchise/{{Gundam}}'', ''Anime/NeonGenesisEvangelion'', ''Anime/GhostInTheShell'' and ''VisualNovel/{{CLANNAD}})'' and cosplay. His brother Ryo supports his hobbies.
** G.S.R is a gamer and among his favorite games are ''VideoGame/GodOfWar'' and ''VideoGame/ResidentEvil''.
** Gami is a fan of ''Manga/KOn'' and ''Literature/{{Toradora}}''.
* PissTakeRap: Sadew frequently does this in some songs from ''Mozaiq''.
* RearrangeTheSong: The band is notable for including rearranged versions of songs from limited-release singles in their full-length albums.
* RevolvingDoorBand: See the list of former members above.
* SignatureStyle: Harmonious power riffing typical of MelodicDeathMetal combined with the poppy synths of J-pop and trance-inspired buildups, together with a stew of elements from different styles of [[ElectronicMusic electronic dance music]].
* SopranoAndGravel: During the Sadew V1 era, the band used samples of female voice tracks for cleans while Sadew himself performed the screams [[note]]he ''did'' provide primary singing on occasion, most notably on "Neo-Gothic-Romance"[[/note]]. The Sophia era had Ryo employ screams. On ''Last Stardust'' it was Kiki on cleans and Ryo tackling the screams. Saika during his time in BSC handled both.
* StartMyOwn: Some time after her departure, Sophia founded Music/SeasonOfGhosts.
* SurprisinglyGentleSong: "Neo-Gothic-Romance" compared to the rest of ''Mozaiq'', it's slower than the rest of the songs on the album and features much more of Sadew's clean singing, giving it a relative ballad feel. "Sai-Ka-No" is this to possibly their entire discography, as it's more of a JapanesePopMusic style ballad, has none of Ryo's screaming, and is not metal in the slightest.
* TokenWhite: Former member Sophia is actually Greek.
** HairOfGoldHeartOfGold
* VisualKei: The band has not explicitly stated themselves as such, but they have performed alongside established Visual bands and have showcased Visual attire ever since the start of their career. The band's former members have also had careers as musicians in the scene.
* VocalEvolution: In the band's early days, Ryo was nothing short of a DreadfulMusician, but by the time ''Epsilon'' was released, he had developed a screaming capacity rivaling Kiyoharu of Music/{{Kuroyume}}, Kyo of Music/DirEnGrey or ''even'' Music/MariaCross or [[Music/AnaalNathrakh Dave "V.I.T.R.I.O.L." Hunt]] in terms of harshness.
* VocalTagTeam: Sadew/Ryo, then Ryo/Sophia, followed up by Ryo/Kiki until 2016.
* WholesomeCrossdresser: Ryu is just one in a list of highly convincing crossdressers in VisualKei, alongside Hizaki of Music/{{Versailles}}, Shinya of Music/DirEnGrey, Mana of Music/MaliceMizer, Bou ex-Music/AnCafe and early Music/YoshikiHayashi of Music/{{X|Japan}}.
* XtremeKoolLetterz: The "e" in ''Epsilon'' is rendered as "ε".
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