Higanbana, carnations. Flowers one would bring to a cemetery. Faintly: fresh gravesoil, gunpowder, iron, blood. Things one would encounter in battle.

Magical. Peaceful, soothing. Touched by death. Life is strained, fading. ~Special~ in the way that the "Mother-Creator" of her world cursed her soul to make her weaker, but also happens to bear the gentle smile of the other goddess of death (according to Hajime Tabata).

Rem's soul is one of the 16 "Loci" or "thrones" as made by the Mother-Creator. Hers is known as the "Loci of Love", one of the core aspects of humanity according to the in-universe deities. 12 of these Loci were kept by the Mother-creator, while the Loci of Love, Fear, Age, and Suffering were cast out. All Loci have repeated the canon universe's cycle exactly 600,104,972 times. In a previous "cycle" in her universe, she was the Judge who deemed humanity inadequate and brought about the end of the world, thus forcing it to begin again. In the current cycle, a god purposefully made her soul weak. This, in turn, made her physical constitution weak to bring about an early death. Hence Cough of Doom^TM. Does she remember the previous cycles? Canonically, only via moments of deja-vu. According to the in-universe god, while even a person might not literally remember, the "the soul remembers", and it might take some triggering/awakening to have her recall details.

hose able to read souls can find out a few things, depending on how deep they look and their power level, plus whatever you think is appropriate:
++ They can find hers ancient, carrying a burden of all hundreds of millions of cycles she experienced beforehand.
++ The most prominent burden involves her condemning humanity and the world. So they might find something rather twisted prominent in her soul.
++ They can be able to detect that she is heavily tied to the concept of love.
++ They will be able to detect that she is loosely tied to death, or some divine power associated with death.
++ They can detect that hers is cursed by divine power to shackle her soul.
++ Additionally, those able to sense souls will see that not only hers, but numerous others she has harvested. See "phantoma" drop-down menu for total count.

Generally good, considering Escordvi-mechanics have brought her back to life. But, she suffers from illness/cough which grips her at random times but especially during bought of stress. She appears more sickly and pale when it flares, and her voice becomes hoarse. In canon, it brought her to the point of being chair-ridden. Rem is under the impression that she is ill due to an experimental plague brought by a mutant malboro that was set upon her village by the Milites Empire. In reality, she suffered this progressive illness due to a shackle/curse on her being that was placed on her by the Mother-Creator.

Born into a world in which all are blessed to forget the dead, Rem grew up in a border-town between Rubrum and Milites that was often not seen as important enough to protect by the former's military. Eventually, the territory was attacked by a mutant malboros as a monster-plague experiment by Milites. The experiment was deemed too dangerous, and Milites ordered the hamlet to be destroyed so as to prevent Rubrum from gaining intel on their bio-warfare attempts. Her village was obliterated, and the territory was conquered by Milites. Fortunately, she escaped with her childhood friend, Machina, only to be later separated from him due to war. Like so many other children in her world, she grew up as an orphan and jumped between foster families. Vowing to become stronger, to find Machina once again, and to protect those she loves, she studied and trained hard enough so she could be enrolled as an Agito Cadet in Akademia, Rumbrum's premier military school. There, she studied and trained, reunited with Machina, and eventually became chosen to enroll Class 0, a class reserved for Rubrum's most elite cadets.

Given that FFT:0 is a "dead canon", I have a dedicated Inferances & Headcanon page that I made to try to sort out some of the mysteries involving her and her canon.

Tender, soft-spoken, attentive, nurturing, helpful, and excessively patient-- even to those who are short, upset, or hostile with her. When she converses with someone, she gives them their full attention. Not openly confrontational. Tends to obey orders given by higher-ups. A healthy respect and fear for authority and deities. Empathetic towards those who died (note that in her world, all are "blessed" to forget the dead).

All in all, Rem is a young, friendly woman who grew up in a world in which all as “blessed” to forget the dead. She’s a child soldier, sees nothing wrong with this, and actively reaps souls (in her canon, called “phantoma”) when finished with enemies along the battlefield. She’s a ride-or-die kinda gal, literally, and she can and will kill others (or sacrifice herself) because she’ll give up anything to protect those she loves.

That being said, despite all the war she’s endured, she’s actually one of the more well-adjusted characters in her world! And that’s including how many times she’s lived and died in previous cycles in her world (which she can’t remember, but her soul somehow does— a good thing too considering last cycle she deemed humanity sucks and ended the world). SO YEAH ANYWAYS. She’s caring and puts others first, is actively conversational, and loves a good pun and to tease others. Unfortunately suffers from incurable illness with a terrible cough. Don’t worry, she’s Fine. It’s fine. Nothing suspicious there.

⯌ Physical Combat. Grew up as a child soldier, uses twin daggers (stored in hammerspace). Acrobatic, resilient, athletic. Quietly vicious, but merciful. She doesn’t like killing, but she’s done a lot of it, and she will do more. Rem's gameplay wiki here.

⯌ Magic. In-game stat-wise, the most powerful user across all types. Canonically, she favors fire, lightning, and healing. List of spells here.

⯌ Primus L'cie. Canon-end only. Grants her demigod status, near-immortality. When activated in this mode, Rem gains superhuman strength, senses, speed, and both extraordinary physical and magical recovery times. Auto-haste/regen/protect/shell are applied on top of this, and she's given a bit of an extra sixth sense to others who hold power. Her eyes glow red, she is able to fly (with or without using wings in vermillion-bird style), cloak herself and her weapons with fire, and withstand a lot of damage. Given this happens at end-game, it is unknown whether she inherits the rest of the previous Primus l'Cie's powers (e.g. making multiple fire-duplicates of herself to assist in battle). Primus l’Cie have been shown in canon to wipe out entire cities with an attack, create giant craters in their wake, eradicate battalions of soldiers (think 15k+) with a single spell, and life-siphon from multiple living people for their summonings. See Inferances & Headcanon for more info on quantifying her l'cie power. POWER NERF: "While Rem is still able to use her Primus l'Cie form after one use Rem will be unable to use the form again for another month. She will be left very fatigued after use."

⯌ Phantoma/Soul-harvesting. Rem can rip the “phantoma” (e.g. life-essence, soul) from anything that has perished. She can use its soul to supplement or increase her magic, or she carry as many souls as she wants with her for later use. Once she rips the soul from a corpse, the body violently sublimates into a fine, red mist. See Inferances & Headcanon for more info about phantoma gathering capabilities. See "phantoma" drop-down menu for count number below.

⯌ Eidolon-Summoning. Can summon the following: Bahamut, Shiva, Ifrit, Diabolos, Odin. Eidolon wiki here.
⯌ Nerfed-powers. Here. Instead of dying to summon an eidolon, she only falls unconscious. L'cie status nerfed to one-time use per month, and then she's drained of energy.