Turns out that "Gryffindor Complex" is not a general Harry Potter fandom term, so I guess my BFF and I made it up on our own in high school.
Anyway, a Gryffindor Complex is the tendancy to charge into a dangerous or fragile situation with good intentions, plenty of bravery, and only a sketch of a plan, like H.P. & Co. did. When the plan didn't work out, they were always surprised and indignant, as if to protest to the world: "But I'm a Gryffindor!" It's similar to having a White Knight thing going on, but without condescending to your object of heroism.
These are for a friend who has a Gryffindor Complex. He did something very brave-- and it was the right thing to do-- and it didn't work out like it should have. He was on the phone with me very late at night (or very early in the morning if you want to be specific) just trying to process the very bad night and the injustice of it all and it made me think of "But I'm a Gryffindor!"
I wouldn't have him any other way. I had the yarn and I wanted to make him socks, so these are going to be a testament to his bravery, his good heart, and his belief in doing the right thing even when it's not the easy thing.