Glad you are reading them! Awesome books. IMO, the best by far are the original trilogy (Princess/Gods/Warlord) plus #6 (Master Mind) and maybe #10 (Llana of Gathol). I would read at least those, but if you are not tiring of the series, just read them all!
I rewrote a bit of my original post and found new images for a “handout” for my campaign:
Fun fact: Orions hail from the Rigel system. Their civilization is ancient and mostly in ruins for unknown reasons. Orions come in many colors. There's your villainous but swashbuckling Blue Orion pirates:
There's the Yellow Orions, that last bastion of Orion civilization:
Who can forget your classic Green Animal Women:
There is also this White Orion slaver (good to know human PCs can disguise as native Orions):
RPG lore says, screw it, how about ... wait for it ... Ruddy Orions?
Orions are physiologically similar to the blue Andorians, though Orions lack antennae. Both cultures generally value passion over logic. But the warlike Andorians are loyal bulwarks of the Federation. After the trade-loving Orions formally joined the Federation, their entire space navy fleet vanished, apparently pirated by rascally mutineers.
I hope you enjoyed this; I made up about half of it, inspired by the Barsoom stories of Edgar Rice Burroughs.
Fantastic campaign concept. The FASA Orions book had (from memory - books lost in house move!) three Orion types uplifted and enslaved millenia ago by some ancient super race. But the Os finally rebelled and took over. Much like ST now, the Trinary system was a core trading world for myriad alien societies/empires/alliances etc. So plenty stuff lying around to be discovered. Os were :- Grey (light grey to dark grey to jet black) who were the technicians, diplomats, scientists etc Ruddy (yellow to brown to red) who were the traders, commanders, ship crew etc Green (yep, shades of green) who were the muscle, "grunts" and exotic "slave" women (who actually had a tightly managed "guild" so enabling them to decide who "owned them at any given time!). But Ruddy's actually overan, mostly wiped out and enslaved the remaining Grey's a many hundred years ago, so starting a slow technological decline. Still living Greys are enslaved in sealed secure modules. A SF Intelligence team discovered this but got stopped by the Os before they could get away. Maybe an ongoing campaign thread?