Kou is one of the Partners in Arcaea. She is unlocked by purchasing the Crimson Solace pack in the "Side Story" section.



Kou's name means "crimson" in Japanese.


Seemingly in reference to both her namesake and the name of her pack, Kou is primarily dressed in shades of red.

She has long, straight, light pink hair and green eyes. In her hair, she wears a burgundy headband that is shaped like a pair of rabbit ears and has gold ornaments at its tips.

Kou wears a long, faded crimson garment with a strapless sweetheart neckline over top of a short burgundy pleated skirt with a white stripe. The center of her top is white with white buttons to the sides; its lower half also has white buttons and stripes and splits below her waist, revealing her skirt. A brighter crimson ribbon is fastened loosely around her waist and decorated with gold ornaments. Kou's sleeves, separate from the rest of her clothing, are crimson with pale pink and white ruffles that extend long enough to cover her hands. She also wears a white collar with a ruffled bib and a burgundy bow, to which more gold ornaments are attached.

Her boots are off-black, have laces, and extend to her thighs; underneath she wears a pair of tights slightly lighter in color.

Kou is always depicted holding a white stuffed bear with light pink ears, hands, and soles. Its eyes are represented by gold ornaments, it has a crimson bow around its neck, and its headband is identical to Kou's. When awakened, the teddy bear is shown holding a cake on a plate.


Kou has been officially described as "a cheery girl with a long history in the world of Arcaea".[1]


Kou can awakened at Level 20 since v2.4.0 by consuming:

  • 25 Crimson Cores.
  • 5 Hollow Cores.

Stats by Level

LEVEL 1 2 3 4 5 6 7 8 9 10
FRAG 60 60 60 60 61 62 63 66 68 72
STEP 47 47 47 47 48 49 50 52 54 57
LEVEL 11 12 13 14 15 16 17 18 19 20
FRAG 77 81 83 86 87 88 89 89 89 90
STEP 60 63 65 67 68 69 69 69 69 70
LEVEL 21 22 23 24 25 26 27 28 29 30
FRAG 91 92 93 94 95 96 97 98 99 100
STEP 71 72 73 74 75 76 77 78 79 80


Kou is mainly focused on the FRAG stat, and is practically a reverse of Tairitsu (Axium) and Lethe.

  • Her maximum FRAG stat translate to 1.80x fragment multiplier.
  • Her maximum STEP stat translate to 1.40x step multiplier for world mode.

Kou is especially useful for farming fragments due to the high fragment multiplier. If the player does not have Kanae or an awakened Pandora Nemesis (MTA-XXX), Kou is arguably the best partner to use for farming fragments.

Kou's awakened form was added on October 8th (Version 2.4.0). This makes her the first side story partner to receive an awakened form.


  • Promotional reveal image.
  • Congratulatory image by シエラ (cierra) for lowiro's participation in Comiket 92
  • Kou's full body art as shown in game.
  • Kou's partner icon.
  • Promotional image for Kou's awakened formGo to Twitter status announcing the awakening


Starting Partners HikariTairitsu
Story Partners Tairitsu (Axium)Tairitsu (Grievous Lady)Hikari (Zero)Hikari (Fracture)
Side Story Partners KouLetheEtoLunaSayaKanae
Collaboration Partners SapphireStellaHikari & FisicaTairitsu & TrinHikari & SeineTairitsu (Grievous Lady) & Chuni Penguin
Limited-Time Partners IlithShirabeHikari (Summer)Tairitsu (Summer)AyuEto & LunaYumeNono ShibusawaHaruna MishimaRegulus (MDA-21)Pandora Nemesis (MTA-XXX)Chuni Penguin
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