Momoshiki Ōtsutsuki

was a member of the Ōtsutsuki clan.

Background
Momoshiki and his subordinate, Kinshiki Ōtsutsuki, originate from an unknown location, which also contains its own God Tree, whose power supply has been depleted. Like Kaguya Ōtsutsuki, they also wanted to recollect all chakra into a new Chakra fruit, only to create medicine that could sustain their godlike power, youth, and longevity. Fearful of their arrival, Kaguya created the White Zetsu Army in order to fend off against them should they ever attempt to steal her chakra.

Personality
Momoshiki was typically calm, collected, and calculating. However, he had been prone to demonstrate sadistic tendencies, which was shown during his and Kinshiki's attack on Konoha, where he laughed after seeing distressed citizens while firing his elemental attacks. Momoshiki also had a severe superiority complex and thought very lowly of people other than himself, calling Naruto, Sasuke, Boruto and Sarada "lowly beings". Likewise, he also cared very little for other people, even his closest comrade. When he was in a difficult situation, he absorbed Kinshiki without a second thought in order to claim more power for himself. Similar to Boruto Uzumaki at the beginning of the film, Momoshiki was also uninterested in hard-work, preferring to absorb and use the techniques of others instead of relying on his own personal strength. Any effort disgusted Momoshiki, and he was even greatly angered when his clothes were ripped during his final battle against his enemies. As is fitting of his lazy personality, he was easily intimidated when opponents powerful enough to pose a threat to him learn his weakness and rely on taijutsu to fight him. Sasuke and Naruto both agreed Momoshiki's personality is a mirror image of Sasuke's when he was bent on killing Itachi.

Appearance
Momoshiki had pale skin, and pale-blue hair which he kept in a long ponytail. His hair was parted down the middle in a zig-zag pattern, and his head was adorned with a pair of flat, curved horns which resembled bulls horns (unlike Kaguya's, who's had resembled rabbit ears). He had delicate facial features and his eyebrows were cut very short as a symbol of nobility. He dressed in a traditional white kariginu hunting robe, baggy pants, a pair of tengu-geta, and a single black glove on his left hand, with a hole cut into the palm for his Rinnegan, which was red in colour. He also wore a transparent veil over his head.

After absorbing Kinshiki, Momoshiki's appearance took a drastic change including; black sclerae, white irides, dark-red skin, a pointy chin, fangs, claws on his hands and feet which were exposed, white hair, ponytail enlarged and became much spikier, sharpened bull horns, white markings under his eyes and a massive increase in size. His Rinnegan on his palms turned purple and he awakened a third one on his forehead.

Abilities
Momoshiki was an extraordinarily powerful being who, alongside Kinshiki, was deemed a threat greater than Kaguya, the progenitor of chakra on Earth. He was capable of holding his own against multiple Kage-level opponents simultaneously. After absorbing Kinshiki, he could fight near evenly with Sasuke Uchiha and Naruto Uzumaki, who both utilised the Six Paths Chakra.

Chakra and Physical Prowess
As an Ōtsutsuki, Momoshiki was gifted with extremely powerful chakra. He could also absorb any technique that he encountered, as well as an opponent's chakra. Momoshiki possessed enormous strength, sending Naruto back crashing through a wall with a single kick. He could also move swiftly to avoid enemy attacks.

Byakugan
Momoshiki wielded the Byakugan in both eyes, granting him a near 360° field of x-ray vision (with the presumed exception of a small blind spot at the upper thoracic vertebrae), and the ability to see the chakra pathway system. Using it, he could see Kurama's chakra that was sealed within Naruto.

Rinnegan
Momoshiki also wielded the Rinnegan in the palms of his hands. He could absorb ninjutsu with his right, and utilise said ninjutsu with his left. By using his Rinnegan, he can also turn any target into chakra edibles, granting him their abilities once consumed. Unlike other Rinnegan wielders, Momoshiki's Rinnegan was red in colour instead of light purple. However, after transforming from his absorption of Kinshiki, the Rinnegan in Momoshiki's palms turned purple and he gained an additional purple Rinnegan on his forehead. He could create black receivers as well.

Ninjutsu
Momoshiki could absorb an enemy's technique and utilise it on a much greater scale, as seen with the Tailed Beast Ball, the Shadow Sewing Technique, and the Rasengan, the latter of which, uniquely to him, turns red in colour. He was capable of flight and had some knowledge in fūinjutsu, evident from his attempts to extract Kurama from Naruto's body. He could also create red glowing weapons.

Nature Transformation
With his Rinnegan, Momoshiki could use all five elemental nature transformations easily through absorbing his enemies' elemental techniques. He could create enormous elemental monsters, such as a demonic fire phoenix and a lava golem, which was powerful enough to battle a Susanoo-clad Kurama. Momoshiki's Fire Release was strong enough to overpower Sasuke's Rinnegan-enhanced Susanoo and severely burn him. He could also perform Wood Release, capable of manipulating the God Tree's roots and create spears. In the novel, Momoshiki could also use the Ice Release.

Boruto: Naruto the Movie
Momoshiki and Kinshiki encountered Sasuke in another dimension as he was seeking information on a threat greater than Kaguya Ōtsutsuki. In a blizzard, Kinshiki fought against Sasuke, while Momoshiki watched from afar and was enticed by the power of Sasuke's Rinnegan. After Sasuke escapes, Momoshiki and Kinshiki eventually made their way to the real world and began their quest to gather chakra. They first encountered Killer B, and Momoshiki easily manages to defeat him by absorbing his attack and using it against him. He then absorbs Gyūki's chakra from within Killer B and leaves him unconscious, despite the attack, Killer B survives. Unsatisfied with their chakra consumption, they then focused their attention on their next objective: capturing the Nine-Tails by kidnapping its current jinchūriki, Naruto Uzumaki, the Seventh Hokage.

Momoshiki and Kinshiki appeared in Konohagakure during the Chūnin Exams and created massive chaos. Momoshiki kicked Naruto out of the arena and remained on the side while Kinshiki destroyed most of the arena and tried to attack Sasuke and his daughter. Momoshiki calmly walked past a frightened Boruto, who tried to use his Kote to attack him but all of his attacks were absorbed through Momoshiki's Rinnegan. Sasuke related to Naruto their purpose based on what was deciphered from Kaguya's scroll and they are a stronger threat than Kaguya. When asked by Naruto what they wanted, Momoshiki explains he and Kinshiki want to gather Kaguya's scattered chakra into a new Chakra fruit and complete what Kaguya failed to do by cultivating it into a new 'cinnabar panacea', which he says will grant them eternal youth and supernatural powers. Because of Kurama's powerful chakra, they desired to take Naruto and extract the beast's chakra so they could use it for their own purposes. Momoshiki and Kinshiki attacked Naruto, Sasuke, and their children, leading Naruto and Sasuke to combine Kurama and Susanoo to shield themselves. All the while, Momoshiki laughed hysterically at their efforts. To end the battle, Momoshiki created a giant black ball that was amplified by the powers he stole from Boruto and launched it upon them. Ultimately, Naruto allowed himself to be captured by Momoshiki and Kinshiki while Sasuke protected Boruto and Sarada.

Momoshiki and Kinshiki took Naruto to another dimension and bound him to begin the ritual of extracting Kurama's chakra from inside him. Sasuke, Boruto, and the four other Kage arrived to rescue Naruto. Momoshiki fought Sasuke while the other Kage fought against Kinshiki and was defeated with ease. Wanting to finish everyone off once and for all, Momoshiki turned Kinshiki into a chakra pill and swallowed him, which increased his strength and his body underwent a drastic change. Naruto and Sasuke fought against him and almost had the advantage until Momoshiki briefly imprisons Naruto in boulders and severally burns Sasuke. However, Momoshiki was severely weakened from the combined efforts of the pair.

When Katasuke used his Kote in an attempt to kill him for good, his attacks were absorbed by Momoshiki, restoring his strength. He captured the other Kage with the Shadow Paralysis Technique and was about to kill the other Kage, except for Naruto. With no other options, Sasuke decided to have Boruto use Rasengan to put an end to the threat. Boruto hit Momoshiki with his small Rasengan and freed his father and the other Kage. Enraged at Boruto for damaging his garments, Momoshiki absorbed more chakra pills and increased his strength. Naruto then lent Boruto his chakra to help his son create a Parent and Child Rasengan while Sasuke distracted Momoshiki long enough for Boruto to launch his attack on Momoshiki. First, Boruto ambushed Momoshiki with a shadow clone to take out his Rinnegan and then attacked him with his Rasengan, which collided with Momoshiki's own Rasengan look-alike, destroying him for good.

Trivia

 * Similar to how Kaguya was named, Momoshiki's naming convention seems to follow the Japanese folklore motif. It is a reference to Momotarō, while Kinshiki is a reference to Kintarō.