Kisshoten

 At this point in time, Kisshoten is a support character

Background
Kisshoten is the Goddess of Otsutsuki (女神大筒木, Megami Ōtsutsuki), and created the clan eons ago within another dimension. She tried to persuade them to destroy other races encountered throughout the universe, but eventually, the clan rebelled against her, causing her to be sealed away within a Otsutsuki princess, which would later be passed down through the generations and eventually, she was forgotten.

Kekkei Genkai
Being the originator of the Rinnegan, she possessed extreme prowess in its usage, and is able to use its techniques at a whim with proper chakra usage. She is known to possess at least five Rinnegan, one in each eye and at least three within her heart, making her chakra extremely powerful and potent.

The first young girl she was sealed within was unknown, bt more recently she was sealed inside of Chiyoko Ōtsutsuki, before being passed into her son, Osamu Otsutsuki and sealed within him as a baby.

The Rinnegan appeared within Osamu's eyes due to Kisshoten manifesting her power within him. She was resealed inside him by his mother, Chiyoko Otsutsuki, using the Spears of Power technique, as the goddess was originally passed to him through birth, being dormant inside of her. Kisshoten's Rinnegan possesses a light grey Rinnegan with white ripples around the pupil of the eye, with glowing orbs on the lines of her sclera. With this Otsutsuki Goddess' Dark Heart within, it holds at least three Rinnegan, which are surrounded mb teeth and can be closed like as normal eyes can, though the opponent will never know. When viewed with a Byakugan, it appears as a black heart, its natural color. With the power of Kisshoten, Osamu has a total of five Rinnegan, three of which are always active, making his chakra quite potent.

Trivia

 * Kisshōten (吉祥天), also known as Kichijōten, Kudokuten (功徳天), Laksmi, Mahasri or Srimahadevi is a Japanese female divinity. Adapted from the Hindu goddess Lakshmi and the god Krishna she is sometimes named as one of the Seven Gods of Fortune, replacing Jurōjin. She is considered to be the goddess of happiness, fertility, and beauty.