Prince Igam

Earth Imperial Prince Igam is the crown prince of the Tube Empire, second to only Emperor Zeba himself, and the secondary antagonist of Hikari Sentai Maskman.

She is the sister of Princess Iyal and in reality a woman pretending to be a man, disguising herself as a male in order to be able to claim the throne of Tube.

Past
As the eldest child of the Igam royal family, Igam was raised a male in order to one day take the throne of Tube. However, the Igam family was later overthrown by Zeba, who took the throne of Tube for himself and separated Igam from her sister Iyal under the belief that the two sisters would be the cause of his downfall. Believing that the throne of Tube could be restored to the Igam family if she followed Zeba, Igam cozied up to the tyrant, hoping to one day take the throne back from Zeba.

Hikari Sentai Maskman
After her sister fell in love with Takeru, a human from the surface world, Igam developed a hatred of Iyal for disgracing the Igam family name. She vowed to kill her sister to restore her family's name, but was rendered unable to do after Zeba sealed Iyal in ice as punishment for her warning Takeru of the coming Tube invasion. Thus, Igam resolved to instead focus her hatred on Takeru, attempting to kill him several times throughout the series.

At the end of the series, Igam's identity as a woman is exposed and she is convinced to defect from Tube and ally with the Maskman. She combines her power with Iyal's using the Igam Royal Pendant and combines that with the Aura power of the five Maskman to expose Zeba's true form as Lethal Doggler II.

After the Maskman destroy Lethal Doggler II, Igam abdicates her claim to the throne and leaves it to Iyal, becoming a Buddhist nun so she can find peace.