Thane Kyrell is a human male from Jelucan, from the wealthier second-wave settlers who live in the cities rather than the valleys, introduced alongside Ciena Ree in Claudia Gray's Lost Stars (Disney–Lucasfilm Press, 2015). The two meet as children over a shared obsession with flying and enter the Imperial Academy together.
The defection
Thane's break with the Empire is not a conversion; it is an accumulation. He sees what the Empire does at close range, decides he cannot be part of it, and leaves — first into aimless drifting, then into the Rebellion, largely because the Rebellion is the only thing available that is not the Empire. Gray is careful never to make it heroic. He is angry and disillusioned before he is anything else.
The counterweight
The novel's structure sets his reasoning directly against Ciena's, chapter by chapter. He believes an oath to an institution is void once the institution becomes monstrous. She believes an oath is an oath. Neither of them convinces the other, across a decade and several battles, and the book refuses to hand the reader a verdict.
Canon only
Like Ciena, Thane is a post-2014 creation. There is no Legends equivalent to Lost Stars, which is frequently cited — alongside Queen's Shadow — as the strongest single novel of the current canon's young-adult line.
Reading note
Pair with Ciena Ree. Reading either dossier alone gets you half an argument.