Shinku Nilvalen (シンク・ニルヴァレン, Shinku Niruvaren) or Think Nirvalen was an Elf that lived during the Great War. She is Feel Nilvalen's ancestor. She encountered Riku Dola after her invention of Void Zero Protection and its sister model, Eternal Fourth Protection.
Shinku bears many similarities with Feel. She has long, wavy blonde hair and her eyes have purple irises with pink pupils. She has a small pink ribbon that keeps a small portion of her hair in a plait and a very large bust.
Her clothes consisted of a white, rather revealing dress that showed her midriff and barely covered her chest and legs and golden armbands with a long strip of white fabric that acted as her sleeves. She wore brown sandals with a ballet-like wrap that went just past her ankles and simple, blue bracelets.
She also had a headpiece that was made of four different-coloured jewels - two blue, two pink - and hair accessories that were shaped like white flowers.
She is portrayed in No Game No Life: Zero as a cunning leader. While she was in development of the Áka Si Anse, she often brutally tortured other races, and possibly her own for the simply enjoyment of it. She even states that the ruthlessness of the Nilvalen family is something she still holds up despite the war, and is infamous because of it. She is shown as very cocky, and only caught off guard during Riku Dola's final plan to obtain the Star Cup and when speaking with him.
Shinku was again mentioned by her decendant Feel Nirvalen and fellows Jibril. Alongside with Nina Cliffe, the two were christened as "Corolla" for their achievements for elves during two close but separated periods.
- She was the designated representative when it came to firing the Áka Si Anse
- She is known as a octo-caster (Able to maintain up to 8 spells at a time). Possibly one of the strongest elves to ever exist, the status of octo-caster is the highest obtainable for any elf.