Dylan Seager

 is a Tidelander living in L'Attente, often serving as one of Adrielle's assistants.

Adrielle Cuthbert
At the beginning of Season 1, Dylan is Adrielle's most trusted assistant. The two of them had started a sexual relationship prior to the series commence. After Adrielle continuously betrays her people, Dylan doubts his faith in her as their queen and starts working against her with Calliope "Cal" McTeer to remove her title. In the last episode of the first season (The Queens Knife), Adrielle is stabbed by Gille and is slowly dying, Dylan heals her and she then stabs Dylan with the same knife she was injured with. This was the last scene Dylan appeared in for the first season so whether he survives the stabbing is still unknown.

Calliope McTeer
From their first meeting on the series first episode, Dylan and Cal have an instant connection. Dylan knows that Cal is a tidelander before she knows herself and he helps her understand what she is and how to over throw Adrielle. In The Calling, Dylan tells Cal that he wouldn't know where to go if he was without Adrielle and it is clear that he cares for her.

In The Calling, Dylan and Cal sleep together and Dylan is forced to chose between Adrielle and Cal. Ultimately he chooses Cal but he stays with Adrielle in order to see his Mother again as she is the only person who can show her to him again.

Quotes

 * To Cal about Adrielle "'I'm upset because without her, I don't know where to go'"