Does YOUR MC hold a principle as part of who they are?

MAY IS HOSTED BY WRITING TIPS BY WRITERS, DONALD MAASS'  TWEETS ON CREATING THE PERFECT NOVEL ;)  & SECTIONS INSPIRED BY THESE:

“The single worst piece of writing advice I ever got was to stay away from the Internet because it would only waste my time and wouldn't help my writing. This advice was wrong creatively, professionally, artistically, and personally, but I know where the writer who doled it out was coming from.” ~ Cory Doctorow

DONALD MAASS WRITE TIP 80

List your cast. Give each an allegorical role: mother, destroyer, wanderer, sacrificial lamb etc. Make each more obvious. Make each character stand for a different principle but don’t tell your readers. Show it strongly once for each.

Prefect and perfect are like the same. The trouble is, when you sign up, no one tells you that a Prefect Badge can’t guarantee that anyone will listen to you. Wet floors. Swinging doors. Corners on folders. Could there be anywhere more dangerous in the whole world? I set a good example because if don’t then what kind of Prefect would I be? Sadly, behaviour in the corridor stamps on my ideal of organised until it’s all chaos. That adds cracks on my heart. I think some things age you… even if that’s not chronologically possible.

Which principle does YOUR MC hold as part of their identity?