Here to Raze Hell

A character trait/dynamic that I'm endlessly compelled by is someone dealing with (or, like, failing to) being the child of people who were too busy being good people to have the time and attention to be good parents. This can be anywhere from 'was a public defender who gave a shit working 60 hour weeks with basically no vacations' to 'left their family behind to join the revolution/war effort and is now a universally beloved martyr-hero who saved/remade the world with their final breath' on the groundedness spectrum. The important thing is a viscerally felt but confused and ugly mess of longing, resentment, and guilt about feeling the resentment.

The real antagonist of Fullmetal Alchemist is the nameless Xerxian alchemist who bought a teenage boy to sweep his floors and then was like "hey, I'm going to take your blood to try to play god, you can't legally say no because I own you. If this, say, backfires horrifically in 20 years time, then I guess it's you and your descendants' problem since it's your blood lmao"