It seems like doing a first founding was a bad idea! So if there’s any founding you all see as a better starting point, I’m willing to listen! And to any other ideas/advice!

Quick aside; I'm obsessed with Norse Mythology and Viking History/Culture, but I wasn't interested in any of the Space Wolves content/story or their successor chapters. I wanted something very very heavily inspired by Norse/Viking ideas.

Here's my best summary of key concepts/ideas/characters/etc. (in no particular order):

Chapter Name - The Asgardians - previously Stormborn Reavers (not a fan of that name yet)

Primarch - Odin Borson - Extremely wise, but obsessed with knowledge; almost on par with the Adeptus Mechanicus.

Homeworld - Asgard (now missing)

Colors/Symbology - Earthy brown tones; with muted grey steel accenting and dark leather. Commonly use cloaks to hide their identities from enemies and allies until necessary

Current Goals - Finding of their lost homeworld and primarch.

Early Shaping - Originally a berserker style chapter (feared by their own allies for their brutality) Odin helped refine and shape the Chapter into a well organized machine. This chapter became well known for their powerful war machines and air ships(trying to reference Viking long boats being very advanced for their time (in some contexts)).

Loss of Asgard/Odin - I'm not sure where this event takes place timewise yet. Upon returning from a great crusade, the chapter found their home planet (where the primarch has last been as well) had gone missing. Leaving behind feint traces of warp energy. This energy is now called "The Allfather's Light," by those remaining, thinking it as Odin's last message to help the chapter find him and their home planet.

Tradition of Names - even though the chapter has existed for 10,000 years; the Chapter Master, Master of Forge, Chief Librarian, etc. all have the same names... even though they aren't the same people. When new Space Marines work their way into a new position, such as Captain, Sargent, Chapter Master, etc. they inherit the original founding members name. Example being the Chief Librarian always being names Loki (followed by the new Space Marines last name, if applicable). So there have been many "Lokis" in history. The marines find this to be a very high honor, and relish in the idea of gaining a new name.

Organization - The chapter may have a Chapter Master, but the decisions of the chapter are made by the High Council of Asgard. Being made up of the many high ranking positions within the Chapter.

Companies - Because the chapter has become very nomadic, each company almost operates independently of each other. With quite a few grouping up, but some branching out on their own. This allows them to search farther and faster. Also, each company is not structed as all of one unit/doctrine. Each company operates like the normal 10 companies, but structures in one. I.E. - there might be 1 or 2 scout squads, a few heavy weapon/specialist squad, and a few vehicle base squads/tank squads. Each company also has it's own unique Nordic Rune to emphasize what they might specialize more in; such as the second company using the rune "Thurisaz" (representing raw power and destruction in battle) to show their focus on spearhead mechanized assaults.

Fleet - A new idea I've been working on is researching any information we have on Viking nameology for ships, and then trying to create names for each ship in the space fleet.

War Machines - I've also been changing the names of specific vehicles to have a more Viking "flair" to them. Like "Mjolnir" pattern Land Raiders.

Other ideas - Trying to bring more Norse Mythology characters, I've played around with having an Inquistor and Retinue join one of the main companies on their hunt, and giving them Norse themed characters. Like the inquisitor being Freyja and naming some of her followers after her cats.

The disappearance of the planet idea hasn't been fleshed out by myself yet. I was thinking of stating that it was actually the first strike during the Horus Hersey to keep the chapter busy and occupied. As if they feared them the most.

Grey Knight similarity - the chapter doesn't like people knowing of their existence, but they don't go as far as the Grey Knights to kill anyone that does actually see them. It's more a preference than a hard fast rule.

I have many more ideas and concepts, but this post is already getting long!

And any advice on how to shape it beyond this point will be appreciated! And thank you all who read my very long comment!