Iroyas

Iroyas is the right hand of Akinom, later Necromega, and then Akinom again. She is also known as the Ice Ninja of Despair due to her desire to make the world miserable. However, she is secretly happy on the inside because of exposure to beams of light that leaked into the Shadow Dimension.

DDC
Iroyas was one of the founding members of the DDC, along with Akinom, Riyu, and Ikustan, as the Shadow counterpart of Sayori. One day, after all four of them saw light for the first time, Iroyas suddenly welt warm on the inside, but she was still cold on the outside. Riyu then killed Iroyas while Akinom faked her death and Ikustan ran away, eventually running into Yajin Niroku. Iroyas' soul was sealed inside a red gemstone on the handle of Riyu's switchblade.

Meanwhile, Necromega took control of the DDC after Akinom disappeared and revived the soulless Iroyas into an undead. Because Iroyas was more powerful, she didn't return as a mindless zombie or something. Iroyas, however, was still serving Necromega as his right hand.

When Necromega was killed by Hikari Nakamura, Iroyas turned to dust with the rest of Necromega's undead army.

Rebirth
Later, Antonio Vega and Yuri went to the Nature Dimension and fought against Riyu. Riyu's switchblade was lost in the Nature Dimension after the battle due to interference from a Vargloth. The gemstone containing the soul of Iroyas was found by Sora, the very first Void Ninja. Sora destroyed the gemstone and Iroyas woke up on a bed of red flowers. Iroyas also had white hair and light blue eyes this time instead of black hair and black eyes. The true Iroyas referred to herself as the Ice Ninja of Hope. Iroyas ended up on Earth 1 and helped Kuroninja take down a Vargloth.

Later, Akinom created a clone of Iroyas known as Dark Iroyas. Dark Iroyas looked like Iroyas' original form, when she was serving Necromega. Eventually, Dark Iroyas and Iroyas were assimilated into one Iroyas, who became Akinom's right-hand again.

Return of the Dragons
In Return of the Dragons, Iroyas made a return, and she learned about Sayori becoming the Green Dragon Warrior, so she hired Shadow Hunter Umbra to capture a Dragon Orb so she could fight Sayori in a duel.

Trivia

 * Iroyas is the least uncontroversial subtraction from the Shadow Dimension. This is due to Sayori being the most controversial addition to the Kuroninja Multiverse.
 * Iroyas won a 2019 Kuroninja Award for being the Worst OC. After winning the award, she said "This award show f**king sucks."
 * Iroyas was designed as the inverse of Sayori. While Sayori is happy on the outside and sad on the inside, Iroyas is sad on the outside and happy on the inside.