Hawk & Moor perhaps - I haven't finished reading it yet, but it does seem to go into who played what characters back in the early days
In the early days of 3e, Gygax wrote a series of articles for Dragon magazine detailing some of the adventures Robilar had. Not sure which issues, though--its been a long while. If you can get a hold of it, "Rogue's Gallery" has Robilar's stats with a bit of background.As for Rary--I'm not certain unless you don't mind me referring you to AD&D 2e sources.
I actually would prefer the 2e stuff if you've got any in mind.
Canonfire Greywiki to the rescue!http://www.canonfire.com/wiki/index.php?title=Rary
Oh mein gott im Himmel!"Rary was a low-level PC of Brian Blume..." You think maybe, just maybe, the whole storyline where Rary betrays the "Circle of Eight" may have been inspired by certain, real life, events...
Obviously Rary the Traitor (2e) has the most background about those two. City of Greyhawk boxed set does a small bit on Rary. Later 3e developments are all taken with a grain of salt (such as Robilar in Expedition to the Ruins of Greyhawk), but there was also a good Rary/Robilar article in Dungeon (98?) by Creighton Broadhurst.
You've probably already checked these out but the Dragonsfoot forums with EGG and Rob Kuntz, and Rob's blog, also cover a lot of their antics. I think an early S&T or Dragon had a report on one of Robilar's adventures involving some iron golems. The only things that stick for me are that Robilar had an army including a lot of orcs along with humans, and I saw something about the Rary PC being retired at a certain level because he wanted to be "Medium Rary" -- though I am not sure what level/class would have the title "medium" -- maybe an OD&D cleric?
Here are all of the references in my Greyhawk database:Rany:City of Greyhawk: Folk, Feuds and Factions 25,27Dragon Magazine #82 58Dragon Magazine #194 53,54,55Dragon Magazine #230 12Dragon Magazine #233 92Dragon Magazine #249 90-96Dragon Magazine #268 70Dragon Magazine #269 65Dragon Magazine #299 99From the Ashes: Atlas of the Flanaess 9,10From the Ashes: Campaign Book 8,11,85From the Ashes: References Card #13 Greyhawk Adventures 3,67,68,128Greyhawk Wars: Adventures 24Living Greyhawk Gazetteer 16,37,38,68,126,128,143,144,154,156Living Greyhawk Journal #0 6,7,8,9,10Living Greyhawk Journal #1 27Living Greyhawk Journal #3 15,26Players Guide to Greyhawk 11,21,23,26,51The Return of the Eight 3,5,10,20,53,54,57-60Slavers 127The Adventure Begins 2,4,37,38,62,71,76,97,98,110,122,123The Adventure Begins: Adventure Maps 2The Doomgrinder 7The Star Cairns 5,38,46WGA4 Vecna Lives! 10,14,17,20,87,88,94WGR3 Rary the TraitorWGR5 Iuz the Evil 5,37Arcane Puissance of the Memory By Rary:Dragon Magazine #82 58Lost Spellbook of Rary the Traitor:Dragon Magazine #249 90,91,93,94,95,96Rary's Mnemonic Enhancer:Players Handbook (AD&D) 78Player's Handbook (AD&D 2nd Edition) 162WGR3 Rary the Traitor:Dragon Magazine #191 65,68Dragon Magazine #194 53Dragon Magazine #241 43The Return of the Eight 54,58The Adventure Begins: Adventure Maps 4,5Robilar:Dragon Magazine #37 11Dragon Magazine #249 92,94Dragon Magazine #290 22Dragon Magazine #291 20Dragon Magazine #294 95Dragon Magazine #295 20Dragon Magazine #301 16Dragon Magazine #AN2 96,97,98From the Ashes: Atlas of the Flanaess 7,9,10From the Ashes: Campaign Book 85Greyhawk Wars: Adventures 24Living Greyhawk Gazetteer 15,16,37,38,63,126Living Greyhawk Journal #0 5,6,10Living Greyhawk Journal #2 2,8Living Greyhawk Journal #5 4Players Guide to Greyhawk 11,23,24,26Rogues Gallery 46The Return of the Eight 3,35,42,54,57-59Return to the Tomb of Horrors 3T1-4 Temple of Elemental Evil 28,34,111The Adventure Begins 4,37,38,61,71,76,77,98,99,111WG6 Isle of the Ape 6World of Greyhawk Gazetteer IC,12,19WGR3 Rary the Traitor 4,7-12,16,20,21,26,31,45,48-53WGR5 Iuz the Evil 5World of Greyhawk Boxed Set: A guide to 27,42,IBCThose are all of the published canon or near-canon references that I am aware of up through v3.5. My database currently does not include fan produced materials such as Oerth Journal, Dragonsfoot, Canonfire! or blogs. Nor does it include anything published only on the WotC website (I got tired of fixing broken links). Some RPGA Living Greyhawk material is included, but I currently do not have access to most of it.Early material on Rary is sketchy because he was a PC belonging to Brian Blume who retired him at 3rd level to forever remain a bad pun. There is a Wikipedia Page with a fair amount of background.Robilar was one of Rob Kuntz's PCs and there is a wealth of lore surrounding him. Some of it can also be found on Wikipedia
Wow! Thank you so much!