Just as a reminder for folks and my own sake, I shall comple a short list of our Primarchs (There is only four of em) with a list of quirks and story beats, just so folks don't have to go and reread, i mean you should anyway, Tennis is a good writer and has made some interesting little things.
Sorry about the Double post, but i wanted to have this out when i finished it, if anyone else has stuff they remeber/find on a reread, please let me know so i can add it to the LIST
4th Primarch: Perterabo, Primarch of the Iron Wanderers
-Landed on a isolated station alongside a population of humans terrorized by a hostile AI, is the Second Primarch Found
-A master craftsman
-Learned both Machines and understand the people
-Body is maimed after saving a large amount of his people from destruction
-Lord of a nomadic people with established space as Iron Protectorates
-Builder of weapons and works of art
-Has caused a slight Schisim in the Mechanicum due to his bettering of Technology.
-Does not see the rest oft he Primarchs as true family, but does seem to get along well with Magnus, does nor care for Robute as much.
-His Legion had close ties with the tenth and managed to safely secure many of them into his own once it became clear the tenth Primarch was monstrous
--They remain as the Iron Shields
10th Primarch: Ferrus Occulus , Primarch of the Perfect Legion
-Landed on Medusa but breached into the depths below, raised alongside the machines of the Necrons and taught by the Pharon Trazoekh, the Third and current latest Primarch found
-Knows of the War In Heaven from a (Biased) Necron Source
-Understands Necron Technology
-See's humans as inherently inferior and wants to "Improve" them
-A master of both Metal and Flesh
- Has twisted what Astartes he commands into his "Perfect" soldiers
-Is working with the Imperium but fully willing to cut himself away should they prove too weak
13th Primarch: Emperor Roboute of the Imperial Legion
-Second Emperor of the Imperium
-Leads the Imperial Legion
-Suburb Administrator
-Granted modest approval to both the Gene Cults of Luna and major approval to the Mechanicum of Mars
-Much more intune with his Humanity then the Prior Emperor, but still willing to make the hard choices
-Open to the Ideas of Xenos living in and working with the Imperium
--Which has caused some problems
-Willing to let some form of faiths into the Imperium
15th Primarch: Magnus Stormborn, Primarch of the World Serpents
-The first found Primarch of Fenris
-Not a true "Leader" of his world, but a highly respected Shaman and Teacher, but for all intents and purposes, he rules the world
-His mind is connected to a vast Kraken named "Hagufn"
-His powers are well worn of the arts of Runes, calling of the Spirits and Commanding Storms
-The Legion confronted with their changing Flesh, spoke of it to Malcador
--Who in turn kept them back and kept new blood from entering their numbers
-When Magnus reached his Sons, he worked towards crafting Runes to keep the Change at bay and tried to foster connections with his Sons both old and new