Ah, the 'Ace Valentine' story. I'm assuming we're talking about the web novel series that's been floating around on platforms like Royal Road and ScribbleHub, not some other title I've missed. The core cast is relatively tight, which works well for its personal, character-driven sci-fi vibe. You've got the protagonist, Alex 'Ace' Valentine, obviously. He's that classic underdog archetype but with a twist—he's not just a hotshot pilot trying to prove himself; he's grappling with the legacy of a famous ace for a father, which adds a layer of psychological pressure I found more interesting than the usual combat stuff.
Then there's Maya Chen, his wingman and arguably the emotional anchor of the early arcs. She's fiercely competent and provides the grounded counterpoint to Ace's sometimes reckless ambition. Their dynamic is less about romance (though the fans ship it, of course) and more about a deep, forged-in-fire partnership. The antagonist, Commander Vance Kell, is a fun one. He's not a cartoon villain; he's a by-the-book fleet officer whose rigid adherence to protocol creates the central conflict, making you see his point even as you root for Ace to break the rules. A lesser-mentioned but crucial figure is Chief Engineer Rourke, the gruff tech wizard who keeps Ace's custom fighter, the 'Ghost,' flying. Those four are the pillars the story rests on, in my reading.
I'd also throw in Lysander, Ace's rival from the rival academy, who evolves from a one-note jerk into a surprisingly complex foil. The story really picks up when it moves beyond simple 'Ace vs. the system' and explores how these characters bounce off each other under the stress of simulated and then real combat. The author spends a lot of time in their heads, which can slow the dogfights sometimes but makes the victories and losses hit harder.