For years I have loved the idea of the lost legions, specifically how some use them to make their own legion. My favorite example of this is the Lost and forgotten project, which if you haven’t seen I recommend. Very detailed, well written IMO
and not Mary Sue at all. Ever since I have used that as a standard, to the point that I consider it apart of my head cannon. So that left me with the 11th legion to work with. The Lost and Forgotten project used the Primarch tarot theory as a basis, found here;
Found this very helpful as guide to what kind of character each Primarch had, and how this specific lost Primarch could have interacted with his brothers and what possible character defects influenced his fall.
My first reaction to this was a space pirate haha, which did not sound very interesting to me and would be difficult to write. So I read more of the tarot page and saw how two entries make direct comparisons between the 11th Primarch and two known primarchs that wasn’t concentrated just on how they react to one another. Specifically the entries on;
The hanged man(Sanguinius) Deep similarities yet differences in approach and character make these two a well matched pair.
The sun(Rogal Dorn) The Sun and Fortune are much alike, though the Sun is rather more balanced, centred and self controlled.
Now with these two characters to build off of, I came up with a couple of details about this Primarch that I find interesting and not too far fetched.
1.the Primarch had a gene seed flaw of some kind that was similar to Sanguinius, I think that it had something to do with Sanguinius being connected to all of his marines in some way(his death, the red thirst, the black rage).
2. The Primarch was a leader of his people similar to Dorn maybe? His background is sparse on details other than loyalty and the standard things associated with any Primarch. Except he took over his entire system and re-activated the Phalanx.
3. This Primarch was too trusting of people in general to the point of naive. This comes from the fact that this Primarch has been so “lucky” as it were that he probably always won or rarely lost at anything, no matter how bad the circumstances. Perhaps this was a latent physic ability?
4.His lax or loose attitude to rules and norms bothered many, so insubordination would be common, or at least a confidence to do whatever he wants rather than wait for an order.
5.Regardless of his laxed attitude he was generally well liked by most, or at least not having any real rivals like many of the others.
6.Could be mislead or lied to by others more easily than his brothers.
7.The Primarch utilized a hybrid style of war, perhaps wanted to get up close and personal with enemy like Blood Angels but aren’t as close combat oriented? Drop-pod assaults utilizing bolsters and ballistic weapons?
This makes me think he was younger then most when he was found, and was successful very quickly at conquering his world and/or his system. If you have made it this far I will stop musing here and ask does any of this seem to be plausible? My intention is to avoid creating the Mary Sue chapter of perfect marines with the a perfect Primarch. Thank you for enduring this post, I realized I could have kept writing but I didn’t want scare everyone with an even bigger wall of text, yikes!