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About
Kou Mariya is a female English-language VTuber who debuted independently on YouTube in October 2020 and joined V4Mirai's second generation "Petalight" in 2023. She retired in October 2025 due to contract issues with V4Mirai, marking the end of her character as she transitioned to a new identity.
Bios from their socials (3)
Bio (from YouTube)
Moved to @kou_mariya This is my indie account, but I'm now with V4Mirai !! Making content on that channel instead of here now~!
Bio (from Twitter)
kohu! vampire idol of #petalight 🌸 yt (80k) & twitch partner — producer at @frproductions gen: #V4MPIRE • fanart: #mariyart • ママ: @kujouitiso Work: DM
Bio (from Twitch)
business→ contact@mariya.moe
Character Info
Community
Hashtags
Tags
Twitch Schedule
Recent Broadcasts
Recent Activity
Introduction Video
Gallery
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Personality
Mariya is a very sweet and romantic girl. She attaches importance to be intimate with her fans and support all VTubers.
Appearance
She has long, sandy brown hair with a pink streak and violet-pink eyes with slit pupils that also has a single beauty mark under one of her eyes, pointed ears, and black bat wings sticking out of her head.
Background
Mariya was inspired to become a VTuber after watching NIJISANJI member Pomu Rainpuff and hololive members Minato Aqua and Watson Amelia.
She debuted as an independent VTuber on 3 October 2020 on Twitch.
Fans
- She calls her fans "KouHai" as a reference to "後輩" and her family name, Kou.
Trivia
- Contrary to her non-existent lower half, Mariya is in fact a bottom.
- She gets very scared when playing horror games, or anything that surprises
- She eats peanut butter on pickles as a snack, some fans tried it with an unexpected outcome.
- She likes to make granola in her spare time for giving away as gifts.
- She enjoys eating clay with nutella.
- Labubu Otaku.
Lore
A vampire who accidentally overslept for a few too many thousands of years, Kou Mariya navigates an unknown colorful world full of magic and mystery every single evening. Otaku to her core, Mariya dreams of creating an idol stage of her very own, one that beckons to fans from every world and realm with her songs!
Contributors
This profile is enriched by VTuber Wiki community editors. Thank you to:
Credits sourced from VTuber Wiki page revision history. Vtubie and Hololist do not expose per-page contributor data, so this list reflects VTWiki editors only.
Frequently mentioned
More VTubers from United States
Art credits
Designers, illustrators, riggers and modelers credited on the official character.
- Illustrator* Mango Original
- Illustrator* Kujou Itiso V4Mirai
- Illustratorkujouitiso
- Live2D Rigger* Faf Original
- Live2D Rigger* Ren Atlach V4Mirai
- RiggerRenAtlach
More Info
Profile
Vampire × VTuber × VSinger × V4Mirai = #V4MPIRE
First your neck and then your heart!~
Joining V4Mirai
On 11 November, she re-debuted as a member of V4Mirai second generation, "Petalight."
2024
On 14 February, she launched her first karaoke relay, "ValENtine Karaoke Relay", for Valentine's Day, between 18 VTubers from various agencies: V4Mirai, globie, idol, PixelLink, Phase-Connect, PRISM Project and Production kawaii.
On 4 May, she launched her second karaoke relay, "Pros-in-Cons Karaoke Relay". It involved 24 VTubers: all V4Mirai, all V-Dere, many idol members, many Phase-Connect members, Mint Fantôme, and Miori Celesta.
Between 5 and 6 October, Mariya and Kanna Yanagi launched a 24 hour karaoke relay named "Rockin' Relay". This relay involved 48 VTubers from: V4Mirai, PixelLink, idol, V-Dere, VSPO! EN, V&U, Specialite, globie, Prima Project, as well as Obake PAM and various independents.
On 27 October, Mariya and Spectra Libitina launched a karaoke relay, "Spooky Songfest", themed around spooky songs. It involved 24 VTubers from: V4Mirai, V&U, PixelLink, idol, globie, V-Dere, Prima Project, Utano Pandora, Umi Kyoku, Mint Fantôme, and Miori Celesta.
2025
On 13 January, Mariya announced her indefinite hiatus, citing "sudden personal emergency". She reassured fans that this is not a graduation or a health-related emergency, and promised to be back to streaming at some point. She will remain active on socials when possible.
On 15 January, her YouTube channel was demonetized due to alleged deceptive activity.
On 8 March, Mariya announced her return from hiatus with 2.0 outfit reveal, scheduled for 22 March.
On 22 March, Mariya returned from her hiatus and revealed her 2.0 outfit.
On 30 September, she announced her upcoming Mariya 2.0 3D reveal, scheduled for her fifth anniversary on 3 October. However, although she celebrated her fifth anniversary with a Tweet on 3 October, the model reveal would ultimately not take place.
On 6 October, V4Mirai issued a statement and apology regarding Mariya's 3D Debut and 5th Anniversary stream which did not take place as scheduled, mentioning that discussions with the talent were ongoing.
On 7 October, she appeared as a singer in a charity cover of Ironmouse's Music Box of Fate.
Retirement
On 10 October, the talent behind Kou Mariya, under the new identity of Emiliya Fell, announced her decision to retire the character. Her reason was a desire was to return to independent streaming, but she was unable to negotiate a reasonable agreement with V4Mirai regarding use of the character. A Tiltify funding page was established for a "new beginning." Later on the same day, V4Mirai officially announced Mariya's graduation.
Return
On 7 May, V4Mirai announced that the IP, channel and assets of Kou Mariya have been returned to the original owner after additional discussions.
On 28 May, Mariya announced that she has officially returned to independent VTuber status. On the same day, it was also announced that she will be making a special appearance at the Fantastic Reality: Found Futures concert by IRIAM US on 2 July 2026. Her creator will be keeping her VTuber identities separate for the time being.
On 9 June, she held her "Ungraduation" return stream. The stream lasted over 9 hours, and featured over 50 VTuber guests calling in.
2024
- On 23 November, Mariya participated in the VSPO! EN x Viewer APEX Customs, a custom Apex lobby hosted by Arya Kuroha where all 5 VSPO EN members + Mariya as a guest, were arranged into two squads, competing separately against 18 other trio squads made up of viewers in Apex's Battle Royale mode. Her teammates were Arya and Narin Mikure.
2026
- On 26 July, Mariya made an a brief appearance in episode 2 of The Wildcard Club.
Quotes
- "Before Vtubing, I was alive. After Vtubing, I learned what it's like to be alive. From the bottom of my heart, thank you for 5 years and many more to come!!"
Media
Statistics
- mariya - TwitchTracker stats
- mariya - SullyGnome Twitch stats
- mariya - Social Blade Twitch stats
- Kou Mariya - Social Blade YouTube stats
- Kou Mariya - Playboard YouTube stats