Gremmy Thoumeaux/Expanded Universe

is a Quincy and a member of the Wandenreich's Sternritter with the designation "V" - "The Visionary".

Bleach: Can't Fear Your Own World
As Gremmy was released from his secure cage deep inside the Silbern to fight the Shinigami he is approached by the one person he noted does not show fear or apprehension for him, the Sternritter Liltotto Lamperd. As Liltotto exchanged playful banter with Gremmy, she noted her hunger, to which Gremmy used The Visionary to create several pastries and sweets for her.

As Liltotto enjoyed her gift, she invited Gremmy to indulge in some himself, after he has defeated the Shinigami by himself. While Liltotto thanked him for "saving her life", saying she genuinely wants to repay him somehow, Gremmy just asked her to leave as he believes the Sternritter are all selfish, including Yhwach. Liltotto agreed that what Yhwach does to Gremmy is cruel and hoped that after the war ends he can be free. When Gremmy reveals he has no idea what to do with his freedom should he ever get it, Liltotto suggested he learns to cook so he can taste a wider variety of foods.

Eventually the two Sternritter parted ways amicably, Liltotto leaving with Bambietta Basterbine and Gremmy with his newly-created Guenael Lee.

Bleach: Can't Fear Your Own World
Following his death in combat against Kenpachi, Gremmy's inert brain was secretly confiscated by Tokinada Tsunayashiro, who proceeded to use the powerful brain as a core component to create the artificial hybrid Hikone Ubuginu.

Powers and Abilities

 * Gremmy has the ability to turn fantasy into reality. Both Liltotto Lamperd and Gremmy himself suggested that Gremmy's imprisonment at the hands of Yhwach have stunted his imagination, preventing The Visionary from reaching its full potential.

Immense Spiritual Power: Gremmy is noted to have truly colossal amounts of Reiryoku, and is believed by his fellow Sternritter to be the strongest amongst them all. As a testament to Gremmy's power, it required Yhwach himself to create bindings that could hold Gremmy captive. Gremmy's raw power is of such a degree that it could force Hikone Ubuginu's outright paradoxical nature to exist anyway.

Trivia

 * Although never outright confirmed, it is repeatedly implied to varying degrees in Bleach: Can't Fear Your Own World that Gremmy may have been an aspect of the Soul King, like Gerard Valkyrie or Pernida Parnkgjas.