Kodlak has a journal in the same chest as the Fragment of Wuuthrad he keeps, it gives a little background as to why he likes the player. There is also a book on all the Harbingers, ''Harbingers of the Companions'' I believe it's called, which gives background on the Harbingers, though I'm not sure Kodlak is included.
I'm not interested in reading some journal. I want to have some interaction with the character so I can start developing some emotional feelings torwards them. Their was little interaction with Kodlak so I didn't get any connection whatsoever with the guy. I don't know why I was force to attend his funeral when I barely knew him.
Before Skjor died he and Aela occasionally mention about tonight hunt, and they (I think it was Skjor) mention Kodlak not liking it. WTF I was force to turn into a werewolf, and nobody ever invited me to go to this hunt... WTF!
As soon as you join a new guild the guards will generally stop pestering you about the Companions.
Wrong. I joined the thieves guild and they still pester me about the companions, acting as if I am a new member of the guild.... even know I became the Harbinger.
And after that, they complain they don't like being a werewolf and send you out for a cure.

That's the hilarious part. After all of that they complain (except for Aela) of not wanting to be a werewolf anymore, and then expects you to cleanse out their soul so they can be human again, WTF!