|This article is about a/an villain turned ally in Hikari Sentai Maskman.|
Princess Ial (イアル姫 Iaru-hime), also known as Mio (美緒 Mio), is the twin sister of Igam, formerly a spy for Underground Empire Tube, and an ally of the Maskmen. In the Philippine Dub, she was renamed as Princesa Iyaru also known as Rio and she was voiced by Honey Almansec who also voices Prince Igam.
Princess Ial was sent by Tube to spy for them aboveground. Emerging from a manhole, she almost caused Takeru to crash his motorcycle. Calling herself Mio, she started seeing him, and eventually fell in love.
When Tube's forces were ready to attack, she warned Takeru, but was captured by the Igua Doggler, who pulled her beneath the ground in spite of Takeru's attempts to save her. She was still able to send messages to him through the pendant she'd left behind, and thanked him for the memories, saying that she would never see him again. She then transformed into Princess Ial. Although her "brother" Igam was perfectly willing to kill her, Zeba sentenced her to imprisonment in ice for her betrayal instead. Later, she was revived by Takeru. Kiros also had feelings for her, but they were not mutual.
After Zeba's destruction, Ial was forced to leave Takeru to fulfill her duties as the new empress, though she still loved him.