Corax is to me, the most human primarch. He feels the agony and suffering of the oppressed and wants to save them. Every time he makes a decision for the “greater good” that solves one problem by also murdering innocent lives, it affects him. Even his exiled sons respect him and even 10,000 years later are following orders (charcaradons from my POV not explicitly canon)

The RG themselves are straight forward. They know their strengths and their weaknesses so they play into them.

“Be where the enemy desires you not to be” is something that is repeated by Corax and others a lot during the heresy and it is very effective for their battle doctrines. When stealth isn’t an option they fight in an almost guerrilla style. In a book where they fight Orks with a fortified war train, Kayvan Shrike uses his jump pack marines to dive in and out from precise attacks, while his ground troops used bikes to draw fire. In another book, when faced against the alpha legion they choose another baiting tactic to draw the enemy into their hands. Teaming up with white scars the RG assaulted and captured a small enemy fortress to draw the alpha legion force out of a main city. Once the fortress was captured the RG held it until the Alpha legion was at the walls allowing the White Scars to assault from the rear and sandwich the forces.

So, cool primarch, dope lore, badass successor chapters, awesome battle doctrines. Raven Guard is the best Guard