The storytelling of gives the Tarnished information in pieces, then leaves it to them to put everything together in order to form an idea of events that happened in both the Lands Between and the Land of Shadow. As a result, parallels between events are often not fully realized until the Tarnished has finished their journey and looks back on the characters, their backgrounds, and motivations. Then, with the help of hindsight, missed connections become clear.
[Warning: This article contains spoilers for Elden Ring: The Shadow of the Erdtree and Elden Ring's stories.]
Much of Elden Ring's content can be found exclusively at night, as many enemies and bosses do not roam the Lands Between during the day.
Looking at the goal of Miquella's journey alone already shows a parallel to Marika's past, before the Land of Shadow was sealed off from the Lands Between. Like his mother, Miquella seeks to ascend to godhood in order to bring about his desired changes, hoping that his ideals will be able to start an Age of Compassion and avoid the mistakes that Marika made during her reign. However, the parallels don't end there. Instead, that's the surface of the parallels that exist between Miquella and Marika, and it should have made the twist about him obvious in hindsight.
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In the same way that Marika and Radagon share a single soul but are able to occupy two separate bodies with different personalities and goals, Miquella and St. Trina are the same soul that's split into two personalities and can be separated into two bodies. This is hinted at in, but then it's confirmed in when Miquella abandons his love. Among all the demigods, only Miquella is shown to have a split identity, like Marika, and even their personalities are mirrored, with Miquella being similar to Radagon and taking direct action, while St. Trina wishes to help
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