It wore a simple tunic and had a large band encircling the area behind the fist.

His parents took him to Mimihagis shrine and prayed for Mimihagi to take his lungs away, which Mimihagi did.

As he does this, a shadow resembling Mimihagi begins rising off his back before extending toward the sky as Ukitake screams in pain.

Darkness erupts from Ukitakes orifices as Mimihagi continues rising into the sky; shortly afterward, the tremors in Soul Society stop.

Yhwach notes Mimihagi managed to escape his eyes before demanding to know why Mimihagi is interfering, only for Mimihagi to close its eye in response.

Yhwach attempts to attack Mimihagi, but he is blocked by a shadowy barrier.

Wondering if the will of the Soul King no longer resides in Mimihagi, Yhwach decides to destroy both it and the Soul King, but Ichigo Kurosaki interferes, allowing Yoruichi Shihin to set up a barrier around Mimihagi while proclaiming that they will let it become the new Soul King because it has managed to stabilize Soul Society and is the arm of the Soul King himself.

After Yoruichi is incapacitated and Ichigo is distracted, Yhwach begins ripping Mimihagi off of the Soul King.

After his Schutzstaffel arrive and Ury causes the rest of Ichigos friends to fall off the palace, Yhwach sees Mimihagi trying to attack him and disperses it before absorbing its power, causing him to gain a pattern resembling a chain of eyes covering the left side of his body and the tremors to resume in Soul Society.

The darkness is forcibly pulled out of Ukitake, who collapses.

When Yhwach tried to attack Mimihagi, it erected a wall of darkness in an attempt to stop the Quincy.

When Mimihagi tried to do so, Yhwach stopped it and absorbed Mimihagi instead.

Mimihagi can accomplish this via symbiosis with whatever being it is attached to.

In turn, its power stops the progression of whatever is afflicting a body part or organ of those it blesses for a time; this grants a reprieve from the inevitable for a time, extending their life and making them capable of what they otherwise would not be capable of doing.

With his diseased lungs taken from him, Ukitake lived and became a captain of the Gotei 13, but he frequently coughs up blood and becomes too sick to fulfill his duties as a captain at times.

Pray, abandon Thou the Power of Thine August Eye that Thou hast buried within mine innards.

Onmi no chikara o hiraki tamae.

Waga fu ni uzumeshi onmi no chikara o waga fu o mihanashi hiraki tamae.

Nimegami Bleach