rishid and marik and yami marik is just soooo. *gnaws on table* like if you read the manga there's so much emphasis on how rishid is marik's shadow his doppelganger (his other-self) and then when yami marik comes into power he's like your birthright is actually mine i'm in charge now i govern what's left of our family's fate (like an older brother). since rishid couldn't stand in to save marik from the pain of the ceremony yami marik was awakened/created (ymmv) to save him, creating the usual dynamic of the yami being invoked when the hikari/vessel is being threatened or overwhelmed, but then rishid steps back in and just... usurps that role right back. both of them are aware of marik's deeply-buried crunchy center of depressive suicidality but ymarik believes he's too weak to fight it and originally rishid does too (keeping the truth from him like ishizu does) but when he realizes that him merely being there isn't enough to help marik anymore, he's able to urge marik to fight because he believes marik can have the strength to fight. just the way they are both his shadows and both his elder brother figures (incestuous implications fully intended) and also foils in part of battle city's richly woven Depression and Trauma narrative. godd *goes back to gnawing on table*