Mnemosyne is the Titaness of Memories and one of the six Titanesses released by Pontos along with the Titans Okeanos and Kreios. She is also the elder sister of Cronus, the king of the Titans.
She has a frail, childish appearance and cloudy eyes, but she does not appear to be blind. She is very calm and quiet.
During the Titanomachy, Mnemosyne was secretly Zeus’s consort and became a traitor to the Titans. She helped orchestrate their defeat by stealing Dark Lightning Koios’s “Keraunos”, the Thunder Bolt, which had the power to destroy gods, and giving it to Zeus, who used it to overthrow Kronos, his father. However, it would appear that she was not spared by Zeus for her aid; she was imprisoned in Tartarus with the rest of her family.
She is revived centuries later by Pontos with her siblings. Due to her power over memory, she is the one the other Titanesses turn to to understand why Kronos lost his memories after being released. Mnemosyne’s intervention in battles has been limited, but it is revealed that she plays an important role as Pontos’s ally. Only Dimension Iapetos and Ebony Hyperion have realised that she has been manipulating the Titans’ memories, including Kronos’s, weakening them so Pontos can use them freely to fulfil his plan. However, Menmosyne’s motivations and the true extent of her powers are yet unknown.