Okay, so 'Kill the Sun'? I picked it up on a whim because the cover looked cool, but man, the characters kinda stick with you. The main guy is Zephyr Vance, this sun-scorched scavenger who's just trying to survive in a dying world. He's not your typical hero—he's bitter, tired, and makes some really questionable calls, which I actually liked. The other major one is Elara, this scientist from the last city who's trying to reignite the sun with some crazy tech. Their dynamic is the whole engine of the story: his gritty, survivalist pessimism constantly butting against her desperate, intellectual hope. There's also this weird, silent character called the Cinder-Man who shows up a few times. I'm still not sure if he's a hallucination, a mutant, or something else, but he gives me the creeps in the best way. A lot of the side characters blur together for me, honestly, but those three are the core. Zephyr's sister, Kira, gets mentioned a lot in flashbacks and feels more like a ghost haunting his memories than an active player, which is probably the point.
What really got me was how the author uses the setting—the constant, oppressive heat and the dead cities—almost as a character itself, shaping everything Zephyr and Elara do. Their goals are completely opposed at the start, which makes every conversation a tense negotiation. I found myself flipping pages just to see if they'd stop arguing long enough to not get killed by the environment.