Antoni Rivera

Yzidria Zynchiekche is part of the "zero" arrancar who doesn't follow Aizen, he currenly resides in the Menos Forest, apparently he is the strongest among the three of the "zero" arrancar.

Appearance
He is long-haired and wears cloak, he is also medium in size, his hollow mask remains are some sort of body armor.

Personality
He is very silent, rarely talking, he also is cold-blooded and wll kill anyone. He also don't care on what will happen to his parters.

History
He is the strongest of the "zero" arrancar, many of years ago, he was the leader of Hueco Mundo, but when Aizen arrived, he was forced to leave because of Aizen's ability. He lead two other arrancar and resided in the Menos Forest.

Abilities
He is the most powerful "zero" arrancar, so he is insanely powerful and possesses lots of abilities.

Cero: High-powered energy blasts that can be fired from various body parts, he most commonly does from either his hand or fingers. His Cero is a Black color instead of red, which is more common among Arrancar and Hollows.

Bala: The technique hardens the user's spiritual pressure and fires it like a bullet from their fist.

Hierro : refers to the hardened skin of the Arrancar, which is a result of their compressed spiritual power. He can deflect attacks of similar power barehanded.

Enhanced Strength:

Garganta : is how Arrancar move to and from Hueco Mundo. It literally tears open the dimensional fabric separating the worlds, revealing a tunnel of whirling, torrential energy that must be focused and solidified to create a discernible pathway.

Sonído Expert: He appears to be the fastest of the three "zero" arrancar, who appears to be very fast than to an average arrancar.

Zanpakuto

His zanpakuto is a black-colored katana, which is slightly longer to an average katana.

Resurrección

Yggsiddra

It's command is "divide", in this form, his whole body transforms into a hydra-like creature. He grows up three serpent-like heads, which if cut will produce two more heads, while he made this just using half of his power, in full power he is able to release 8 heads to 16 heads once, the same ability applies in these heads, each is capable of launching Gran Ray Cero, Cero, and Bala. These are also able to launch black energy waves that are very powerful.

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Special Abilities'''

Dark Flame Strike

Each of the heads fires black flames, and affects a wide area, which burns through almost everything, its power level depends on how many heads are there.

Dark Shockwave

Each of the heads releases a gigantic shockwave with devastating effects, its power level depends on how many heads are there.

As of now two of his abilities are used, it is known that he possesses more.