Okay okay new flekille angle... Fleki joking about being a "dark elf" and Marcille being uncomfortable about it... Fleki saying it and teasing with it BECAUSE it makes Marcille unsure and uncomfortable.
No because okay okay rundown : 'dark elf' is a catch-all term for elves who show unsavory behavior or commit wrong actions, wether violence, theft, scamming or lying... It being a shorthand for criminals in general is a safe assumption to make, especially since they're classically demonized already.
"Okay but Fleki? Run me through the situation what does it have to do with flekille." Short sociology lesson, because of urgent needs being unable to be met through honest means & with the system favoring others instead, people from poorer more neglected social classes tend to fall into crime & bad crowds more easily. Having less ressources means the 'solutions' you do have are more extreme, wether it be for regulating your mental health or stabilizing your income or living situation. Here's a study link if interested.
Why I think Fleki may have been lower class, before becoming a prisoner? Okay stay with me here, elves are very hierarchal and xenophobic, even while being colonizers. Referring to the area guide blurbs, the northern central continent (NCC) is managed with more restrictions but also more valued in general than the southern central continent (SCC), which also has a widespread elven population. It's said life is "safe and easy" in the NCC, so alongside all the noble elves we have info for come from the NCC, we can see a dynamic form where NCC continent elves are from a higher safer social class than SCC elves.
Another hint of this is the characters' names. If you compare their name origins, a pattern starts appearing where... Well @room-surprise did the work and has more knowledge than me so, the way they put it:
"It seems like every elf that has a clearly Germanic or Slavic name is either a criminal or a lower-class person and everyone who is higher class seems to have names that are Latin, Greek, or West/South Asian."
And this seems like a lot of large vague groups options that don't mean much, but this tidbit of info becomes more telling when knowing which races are more associated with what languages and cultures. For a full look into it I recommend this essay, but to get to the point here concisely: 'Fleki' is old norse. 'Otta' and 'Helki' are other elves with old norse names, but for what it's worth Otta is from the NCC, and who knows about Helki's origins. They're the only elves with old norse names at all, but three's a crowd.
Who else do we know are scandinavian coded? That's right, Laios and his home region. Tallmen.
Prisoner/non-noble elves tend to have old norse names while none of the noble ones do. And wouldn't that be interesting if tied with tallmen being nordic, wouldn't it be a result of the cultural mixing happening in the less rich regions and the lower social classes, since noble elves are especially xenophobic and uppity about social classes?
Ironically, our protagonist Laios has a greek name, something associated with elves in Dungeon Meshi, but just like Anoutolid and Nussa (two of Laios' father's dogs) could have been picked as names because Laios' father likes names from myths, with the dogs this is canon but in case of Laios it's probably more of a meta joke. ANYWAYS! Go in the essay for more info, all I'm saying is, tallmen = nordic, elves having nordic names = possible cultural mixing, on the continent that canonically has more immigration and less restrictions but is also less safe and 'easy' to live in.
Elves concentrating all their efforts and wealth into the 1% is too real and it checks out. It's also hinted at and mentioned many times through canon and extra info (Misyl's Complete Adventurer's Bible blurb for one) that the canaries overpolice and charge criminals too heavily because they lack manpower, so they want people arrested and want them arrested for longer to have more canaries.
Fleki was arrested because of possession and sale of ancient magic artifacts, and only got into ancient magic for the money. Look I'm just saying, it lines up that Fleki would turn to crime because her material conditions weren't great! And as a criminal, she's automatically fit to either having been treated as a dark elf or joke and taunt about it.
Especially since the lore info extra on dark elves is set somewhere where tallmen approached unfriendly elves, while this could be a tallman unused to elves outside of rumors thus approaching them with a reckless idealized view, the casualness of it makes me think this is the sort of contact that was likely to happen in an area with a lot of elves and a lot of tallmen living nearby each other, ie the SCC.
Mentioning the Mithrun-Hareus parallels AGAIN but Mithrun and the canaries directly contrast Daltian Clan, it' holds up and makes sense a result especially of Mithrun being hareus' exact lookalike. It's fantasy vs reality of Marcille idealizing Daltian Clan and elven military through General Hareus and novels growing up, then realizing that the real elven military is miserable and very much not glamorous and general Mithrun is dehydrated, rude and after her life.
So this plotline about idolizing vs demonizing elves as a race, stances that are very split within the dunmeshi cast, is very Marcille-centric within canon's story. She herself goes from associating with them a lot and being prideful about it & elven customs, to condemning their superiority complex and narrow-mindedness and being on the run from the elven military, before becoming an advisor for a short-lived tallman court, which is seen as dishonorable for elves, as Marcille the half-elf.
There's a bit of an arc here, regardless of how much change she actually went through or if it was always just performance on her part that she wasn't really attached to.
So obviously this is all to say that Marcille having a romance with a very underprivileged elf, a "dark elf", would be not only compelling but relevant. FLEKILLE SUPREMACY!!!!!
Half-elf woman who drank the koolaid a bit growing up and idolized elves and tried her best to fit the image of one x woman who knows personally the shortcomings of that same idolized society and embodies that a bit, who breaks that elegant image by being crass and unapologetic and a criminal prisoner, who would have no problem breaking Marcille's fantasies about it, a full elf who still grew up disadvantaged and demonized. Marcille has been emulating elves all her life, perhaps in the hopes of being accepted more or feeling a bigger sense of cultural belonging, but Fleki is there, showing her hey, it isn't that great anyways, hey it doesn't matter squat if you're an elf or not people will always find excuses to mistreat you anyways. It's Fleki taunting and saying come be dark elves with me and Marcille coming to understand and replying no, we're both just elves.