I think your Marauders/Marauders era characters/Lily are the best I've read anywhere, PS. They are EXACTLY how I imagine them, they're absolutely chock-full of depth and flaws and whatnot, and I think you've captured the essence of the Marauders (which is quite a feat in a story from Lily's POV, lol)- how they're annoying as anything, but also loveable. Unless you're Lily.
That said... I really don't like how the canon characters in The Life Before/Comfortably Numb came out. They're not how I imagine them, they don't do the sort of things I imagine them doing, and I don't even like reading about them. Bah- that's why it's so hard for me to keep writing it- it's gone so horribly off-track from what I wanted *shakes head miserably*
Ok, back to Chrysanta (and characters I like, lol). She's one of the few characters I actually thought out before writing (with the exception of Emily, way back when). I planned out her past (who she was at Hogwarts, who she hung out with), her relationship with all the characters (who puts up with her, who likes her, who doesn't like her), her motivations, why she is where she is, why she did what she did, why she responds to this in a certain way, etc. etc. etc. Usually this kind of stuff only comes out while I'm writing the story- for her, I had most of it planned out before I even started (at least, character mapping-wise) and it was only a matter of filling in the details while I was writing.
Emily, like I said, is difficult to assess as a character. She's been in existence so long- granted, her role in my stories has changed (she initially popped up as the next DADA professor, lol) and she and Cynthia have flip-flopped a lot of plot points and character traits (originally, it was Cynthia who had gone about living as a muggle and Emily was in the wizarding world). But the essence of Emily has been there all along. I have to say, though, there have only been a couple of places in which she became a real character in my writing- not just a plot point or one of the friends. One is in The Life Before and the other is in the whole of After All These Years. She finally acquired flaws and there are times when she is actually unlikeable- and for me, that's a great achievement.
As far as canon characters go, I really like how Lily and James turned out in 24 Hours of Pure Agony, and again in Skipping Stones, or Lily Waits. Sometimes it's really hard for me to depict them the way I see them, but they really turned out how I wanted in those two.
All right, enough rambling

*scampers off*
-Nicole