"Kuwei was hope. And he was a boy who deserved to live without a target on his back."
Nina Zenik about Kuwei Yul-Bo, Crooked Kingdom

Kuwei Yul-Bo is the son of Bo Yul-Bayur, the scientist who invented jurda parem. He is a Grisha with the powers of an Inferni.

Appearance and Personality

Kuwei is described as having black hair that falls on his forehead, a wide brow, the gold eyes of a Shu. He's sixteen and young-looking. There is an extended period of time where Wylan looks exactly like him and it is only possible to tell them apart by the way they speak, and the fact that Wylan is a little taller than Kuwei and has a slightly different facial structure.

Kuwei is hard to get to know, lying about how well he speaks Kerch and imitating Wylan. He plays dumb as a way of entertaining himself and annoying Jesper. As well as being tricky, Kuwei is clever, spending time trying to recreate jurda parem and drawing in his journals.

He is also stubborn, as shown when he repeatedly makes it clear that he wants to go to Ravka once the auction is over. Zoya notes that Kuwei is "as pretentious as he is talented."[1]



Kuwei's father, Bo Yul-Bayur, tried to make a drug that would mask Kuwei's inferni powers. Instead, he created the dangerous drug jurda parem and, fearing it would be used as a weapon by his government, sent samples to Kerch, asking for asylum for him and Kuwei. Before they could be relocated to safety, Kuwei's father died and Kuwei was attacked by the Drüskelle.

Six of Crows

Kuwei was kept prisoner in the Ice Court and was forced to try and recreate the drug until he was broken out by Kaz Brekker's gang.

Crooked Kingdom

He admits that life in Shu Han was not easy for him and his father.

King of Scars

He is currently living in the Little Palace under the name Nhaban, which means "rising phoenix'. He worked alongside David Kostyk in his experiments.

Memorable Quotes

  • "My Kerch isn’t very good."
  • "Kaz seems to think I'm worth a great deal now."



v  d  e
Main Characters Kaz BrekkerInej GhafaJesper FaheyNina ZenikMatthias HelvarWylan Van EckKuwei Yul-BoJan Van EckPekka Rollins
Minor Characters JoostPer HaskellJarl BrumTante HeleenBo Yul-BayurJordie RietveldCouncilman HoedeGeelsSpechtEmil RetvenkoAnyaCornelis SmeetZoya NazyalenskySturmhondDunyasha LazarevaOnkle FelixRaskeGenya Safin
Locations KetterdamHellgateIce CourtDjerholmKerchRavkaNovyi ZemShu HanFjerdaWandering Isle
Groups The DregsGrishaDrüskelleThe MenagerieBlack TipsMerchant CouncilHouse of the White Rose
Events HringkällaHellshowQueen's Lady PlagueKomedie Brute
Miscellaneous JurdaJurda ParemKeftaIndentureDjelGhezen
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