I didn’t read this series when I was a kid, but I finally got around to reading Roger Zelazny’s Chronicles of Amber.
Given it’s an older series, I wasn’t sure how much I’d like it (some of those older series age horribly), but it was actually REALLY good still, and the few minor things that’d aged too much wouldn’t be hard to update for a modern audience.
But the concept of Amber is fantastic, Corwin’s behavior and arc perfect, and I think a TV series could do it justice nowadays. Man, some CGI artists could do some beautiful work depicting a hellride through shadow.
I also would really, really love to see Anne McCaffrey’s Dragonriders of Pern adapted…but there’s a few parts that have aged pretty badly, so it’d need careful handling of things like Lessa and F’lar’s relationship and such. And maybe, you know, keep Jaxom the hell away from Corana.
But I think the whole idea of threadfall, and Impressing dragons, could be done beautifully on the screen. I think a run from Dragonflight to All The Weyrs of Pern (including the Harper Hall Trilogy) could be done. (Then leave the later books out, they don’t really add much, lol.)
The series would need a top-notch composer scoring it, though. I’d vote for Natalie Holt. She did wonderfully with Loki, and it’d be a nice touch having a woman score the series that’d have the Harper Hall Trilogy included in it.
The Honor Harrington series. Would have to be 3d animated IMHO- One major component of the books is humans have received lifespan extension treatments which greatly slows down human aging. So you would need a ton of 18 to 25 year-old actors who can pull off playing 50 and 100-year-old characters.