iirc, the english script was pretty clear on the whole 'suicide by cop' for Marx/Xander and the 'heroic suicide' for Ryoma. I liked the contrast personally. (Semi-related, do you think Takumi and Elise's respective deaths also foil each other?)
Any way I think of definitely isn’t as a direct foil........ I guess within Kamui’s dream sequence when they almost die Elise/Takumi fulfills a similar role, but I feel like the Nohr ppl who died encourage Kamui in more or less the same amount? I could be remembering wrong bc it’s been a while since I’ve played through that part and is one of the chapters I dont have a log for, but that’s how it feels in my memory (altho that could just be me being like “I want far more Marx because I’m relishing in the height of pain and despair)
Meanwhile your death dream sequence in the Nohr route, you like........... needed that definite confirmation from Takumi that yeah, the real him is dead, so you are not morally wrong to murder the fuck out of evil!Takumi
I guess since they both die there’s a mirror being set up, but Elise and Takumi dont naturally mirror each other like Marx and Ryouma do. I suppose rather than foiling each other, their deaths are direct and stark contrasts against each other - Elise dies as a sacrificial lamb, debatably on her own terms, in an attempt to foster peace. Meanwhile it’s largely implied that Anankos made Takumi kill himself so he’d have total control of his body - his death was definitely not on his own terms (although it could be argued he committed suicide to try and escape Anankos’s possession or even that Anankos’s possession simply warped his mind so much that he really would’ve rather died than fallen into Nohr hands - which would actually directly parallel Ryouma’s death), and is used to turn him into the final boss.