i will keep try to keep it short bc otherwise it would be an essay of me talking about them lol but for me: their androgynous appearance, the angst of two people who lived together for so long yet couldn't get too close and despite this still paying attention to one another and their habits from afar, the fact their existences will always oppose one another bc hydro dragon + hydro archon. mostly i like that they're that type of doomed relationship that will never be together bc of circumstances but still care about one another in little ways. before joining the fandom my preferred dynamic for them was platonic soulmates, now i enjoy everything really.