Cassandra is a cold, calculated individual, stemming from growing up among the Roses. She spares little pity for others and has grown slightly homicidal due to a lack of care from the Roses and interactions with other humans.

The first Cassandra was born on R053-BU0 through synthetic means. Her parents were unable to get pregnant naturally, so they sought someone to help them. They met someone in their friend circle who was able to give them a serum that would help Cassandra's mother give birth.

This serum held Rose DNA which helped the birthing process, but mixed Cassandra's human DNA with Rose DNA.

Cassandra was born a healthy and happy young child, but at a young age, she started showing signs of psychic powers. At this time, the 'friend' came to collect their due: they managed to get their hands on the serum with the promise that Cassandra would be brought back to the Roses. In return, the friend would be given a lifetime supply of Anther for their trouble.

Cassandra was taken to a Rose housing facility, where she would spend years being rigorously tested to see the extent of her powers and whether it was possible to extract all the human DNA out of a mutant like her so that a natural-born Rose could have the same amount of power.

Growing up, she hears how little the Roses care about the humans living on R053-BU0. This grows into resentment and a desire to destroy the planet as a last-ditch effort to mercy kill the humans there.

While in her room, she has little to do but read. In one of the history tablets she's sent a passage about a prophecy by someone only going by "the Bookkeeper".

The prophecy foretells of a powerful mage breaking into three. The three consist of a part that is more Rose than human, one that is more human than Rose, and one that is a perfect mixture of both. Combined, the mage shall regain their full power that can move the cosmos and recreate realities.

Cassandra has gotten it in her head that she is the mage, she just needs to find her three parts. Unknowingly, for her, her search has gotten considerably easier....