... Wylan sketched a second peacock feather over Inej’s skin.
Nina paused, “You’re sure?”
Inej took a deep breath. “It’s war paint,” she said, both to Nina and herself. “It’s my mark to take.”
“It’s also temporary,” Nina promised. “I’ll remove it as soon as we’re in the harbor.”
Six of Crows- Chapter 28 (Leigh Bardugo)
... She [Nina] brushed her thumb gently over the bumps and ridges. It must have been the peacock feather, the tattoo borne by members of the Menagerie, the House of Exotics. Whoever had removed it had done an ugly job of it.
Inej was quiet for a while. “You saw my scars.” Nina nodded. “When Kaz got Per Haskell to pay off my indenture with the Menagerie, the first thing I did was have the peacock feather tattoo removed.”
The way Inej doesn't only make the conscious decision to take on the mark she hates so much, to achieve her goal allowing her to fight against the very thing said mark symbolizes, but verbally reassigns another meaning to it...
She's incredibly self-aware. The most mature of the Crows, but perhaps even all of Grishaverse POV characters, allegedly older ones including.