Man, I live for this specific kind of character tension. It’s not just about having wings and horns, you know? The really compelling ones treat their identities as an ongoing argument, not a fixed state. Like in 'The Library of the Unwritten', where an angel-demon hybrid librarian literally has to shelve books in competing sections of reality. Their balance comes from the daily, mundane choices: do I file this grimoire under 'Sacred' or 'Forbidden'? The conflict isn't resolved by a grand transformation; it's managed through tiny, consistent acts of self-definition.
What I find most relatable is how this mirrors non-fantasy internal struggles. That feeling of belonging to two worlds but fitting perfectly in neither? That’s the core. The best-written angelic demons aren't seeking a perfect equilibrium but learning to inhabit the disequilibrium. Their power often comes from the friction itself—using holy light to purify a curse or employing demonic cunning to protect something innocent. The balance is in the application, not the essence.