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The only sibling of hers who came back to her, Helios is the first of Leto's siblings that she reunited with and, for a long time, was the only one she truly saw as family. Grumpy dork and asshole blonde hate life together.
Besides Helios, Serendipity is the sibling that Leto gets along with the best. Not only are they content to be silent around each other, but they have similar tastes in art and music.
The two have similar personalities; they're both spacy, dreamy nerds who are obsessed with romance novels. The only thing that sets them apart are their attitudes; while Ayla is outgoing and friendly, Serendipity is quiet and withdrawn. Apart from Calypso, who's like a mother to her, Ayla gets along the best with Serendipity.
Kirian likes Ayla enough, and he's appreciative of her like any normal sibling. Her more outgoing personality meshes well with his quieter attitude, and he's always content to be around her.
Ayla is very friendly with Kirian and acts as a typical, supportive younger sister. She always goes out of her way to buy the games he's worked on.
Leto is normally indifferent towards Kirian, but she enjoys talking to him about the games that he's worked on.
Kirian's rather indifferent to Leto, but compared to the other siblings, he and his twin are more accepting of her in general. He has fun talking about his games with her.