Akin is the first male human-Oankali hybrid child. When he's kidnapped by human resisters who refuse alien merger, he sees both sides — the humans' right to self-determination and the Oankali's genetic imperative. Butler writes the most nuanced alien-contact middle chapter: there are no villains, only irreconcilable needs.
Brief sexual references.
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Moods: Philosophical Alien Political Complex
Tropes: Hybrid Child Two Cultures Resistance Genetic Merger
Half — his hybrid perspective drives the philosophical conflict.
Different discomfort — focused on what "consent" means for a species.
Yes — the trilogy concludes with Imago.