The Aquarion franchise centers around the interactions between a number of characters who reincarnate every 12,000 years.
After her death, Celiane's soul split in two and was reincarnated in the bodies of her descendants, Sirius de Alisia and Silvia de Alisia. Silvia would later reincarnate as Mikono Suzushiro, but it is unknown what became of Sirius.
After his death aboard the Aquarion, Toma's shock at finding out Apollonius had not, in fact, been reincarnated in the Aquarion as he had believed caused his soul to split in two: love and hatred. His hatred became the Shadow Angel known as Mykage Towano, who would go on to harrass Neo-Deava. It is unknown what became of the other half of his soul.
Pollon was a Shadow Angel and companion to Apollonius. After Apollonius betrayed Atlandia, Pollon chose to stay by his side regardless of the consequences. However, Pollon developed a crush on Celiane, and wished that they could meet again in the next life.
12,000 years later, Pollon was reincarnated as Apollo. True to Pollon's wish, Apollo and Silvia developed a friendship that slowly deepened into something more. However, the two were separated when Apollo chose to sacrifice his life to save the world.
Another 12,000 years later, Pollon reincarnated as Amata Sora, a boy born to actress Alicia Sora and Altairan commander Izumo Kamurogi. Due to the interference of Mykage, Amata was later split in two, body and soul. One half remained on Vega, while the other went to Altair and became Kagura Demuri.
Scorpius was the third pilot of the Aquarion during the first war with Atlandia, and was personally responsible for Apollonius' death. 12,000 thousand years later, he reincarnated as Reika. It is unknown what became of his soul 12,000 years later.