Mumm-Rana is the polar opposite version of Mumm-Ra. She resides in the White Pyramid and calls to the Ancient Spirits of Good. She also has the ability to transform from her 'mummy' form to a much stronger, warrior form.
Mumm-Rana is most likely the universe’s answer to Mumm-Ra’s existence. She is similar to Mumm-Ra, but only to fight against the forces of evil. She is under the guidance and blessings of the Ancient Spirits of Good. As the Black Pyramid is Mumm-Ra’s home base, the White Pyramid is Mumm-Rana’s. She replenishes her powers within in it by resting in her mummy form on an ornate, smoothed stone platform on a dais.
When she transforms into her warrior form, Mumm-Rana chants: "Ancient Spirits of Goodness, transform this gentle form to Mumm-Rana, the Ever Good".
In her true form, she is shown to be very powerful, as she bested the mutants, Queen Luna and Luna in battle with ease. She even defeated the Thundercats with very little effort, under Mumm-Ra's spell. However she is not as powerful as Mumm-Ra, as seen when he beat her in combat. Her powers, just like Mumm-Ra, are also limited depending on the time she spends outside her pyramid.