— Think to Riku, No Game No Life: Zero
Think Nirvalen (シンク・ニルヴァレン, Shinku Niruvaren) was an Elf that lived during the Great War. She is Fiel Nirvalen's ancestor. She is the creator of the Spirit-Breaking Rites, including Void Zero Protection and Eternal Fourth Protection. Riku Dola paid her a visit as part of his plans to end the war.
Think bears many similarities with Fiel. 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-colored 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 the development of the Áka Si Anse, she often brutally tortured other races, and possibly her own for the simple enjoyment of it. She even states that the ruthlessness of the Nirvalen family is something she still holds up despite the war and is infamous because of it. She is shown as very arrogant and only caught off guard during Riku Dola's final plan to obtain the Suniaster and when speaking with him.
In Practical War Game, it was seen that Think was incredibly apathetic in terms of taking care of herself, her supposed husband Nina Clive would take care of her and do almost everything for her, including buying pornographic materials. She's also shown to be quite lascivious towards Nina, often sexually harassing him by summoning tentacles pumped with aphrodisiacs or licking him.
After her first defeat in the hands of Lóni Drauvnil, she became nihilistic and had the idea of ending the war by killing everyone.
Magic: Think Nirvalen's magical prowess was known to be legendary among the Elves. Being the creator of the Spirit-Breaking Rites, she earned the title of "Grand Magus" along with Nina Clive. As the overseer of the Aka Si Anse, as well as being the only known octo-caster (since Nina's recognition was fake), Think Nirvalen's magic power rivaled only the finest to ever grace the Elven race. Even her descendant, Fiel Nirvalen, was considered by those who knew her secret, a crown jewel among the elves as a hex caster. Given the historical background and accomplishments of Think Nirvalen when compared to other Elves, it is safe to assume that she may very well be one of the strongest elves to ever exist.
Intellect: She was a master strategist and manipulator, capable of seeing through the dwarves' plan of using the Phantasma "Insein Nebia" against the northern territory and their full scale assault on the elven capital Melruine, turning both instances into her favor by manipulating behind the scene.
Think was totally negligent of her own wellbeing when she was engrossed in her research. She could leave herself fully naked and go without cleaning herself up because it was "too troublesome". According to Nina, she had multiple near death experiences due to being too focused in her work, including starving herself until becoming unable to move, almost drowning herself in the bath, and overusing magic until her soul stone totally depleted.
Think was again mentioned by her descendant Fiel and fellows Jibril. Alongside with Nina Clive, the two were christened as "Grand Magus" for their achievements for Elves during two close but separated periods. She is the archrival of Lóni Drauvnil, the leader and the strongest dwarf during the period.
- She was the designated representative when it came to firing the Áka Si Anse.
- She is the only known octo-caster (Able to maintain up to 8 spells at a time) to ever exist; far surpassing every elf that has currently been introduced including Fiel Nirvalen.
- She had a bet with Nina during the end of the Gaiden story, in which the loser shall become the wife in their marriage. Since the noble family that prevailed during present days is "Nirvalen" instead of "Clive", it can be assumed that Think won the wager.