Yona is like a very realistic saintess. If we were to have an actual saintess in our world and her circumstances are like those that we read about, surely, that person will just wish to be free. Being selfless and kind is exhausting and to preserve your image in this world, you have to watch your every action and to minimize comments about you you'll have to appear less in public which just ultimately sucks
Honestly tenka is my favorite character here all for the reason that she's done a lot (or the most) for yuuki and the gang even if she seems so laid back. Really fit as a chief <( ̄︶ ̄)>