LightKing wrote:
JustaerinAtTheWall wrote:So, if we don't include Primarchs, i would argue that on the chaos side is Typhon. He is a herald of Nurgle, host of the Destroyer hive and flies of Nurgle,and has been known to level planets with his powers solo. I don't say Abaddon because he's had 12 unsuccessful crusades before this one, and he's finally moving past Cadia this time around.
As for the loyalists(Not including Cato Sicarius), i'd cast my vote for Nathaniel Garro. He was chosen as the Sigilite's right hand man. No other astartes can say that, and when you consider that Malcador was the emperor's right hand man, that(makes him like an index finger or something

) makes a statement about Garro as a soldier.
Didn't Garro betray Mortarion?
Do you only reply to people's answers with more questions?
Here's your answer:
https://lmgtfy.com/?q=nathaniel+garro
Also, I would say that everyone has the traitors covered, in terms of loyalist I would say Koorland gets pretty close. He (was) the last survivor of the Imperial Fists, became its Chapter Master and rallied the other successors of Dorn against the Beast, helped found the Deathwatch, become Lord Commander of the Imperium and deal with the politicking of the High Lords while he was still alive.