I think your character is an interesting approach, so I say go for it, but as others have said do prepare for a lot of backlash or scrutinizing of your character. As it is rather a difficult approach.
Warren posed some good questions to think about. I just wanted to bring one lore tidbit up in addition to all that. Primals, regardless of whether they are deities worshiped by a tribe (Ifrit, Ramuh, Leviathan, etc) or a reincarnation of some forgotten legend of times past (Bahamut, Shiva, King Moggle Mog, Phoenix, etc) a few things have to be in place for the Primal to persist.
1) Worship or fervent prayer to the deity or legend - which you've already established in your backstory.
2) Enough crystals to fully compose a corporeal form in the Physical Plane. The larger and more powerful the Primal, the more crystals are required. As you're a Lalafell, a smaller amount of crystals could likely create the form, however, a small amount of crystals will also ultimately make for a very weak primal.
3) Lastly, (and most tricky) because Primals do not belong on this Physical Plane, they must constantly absorb large amounts of aether from the Lifestream in order to persist. This is what I think Warren was getting at with the Scions of the Seventh Dawn. So long as your character remains summoned, she is effectively killing the planet. Which is why Primal summonings are dealt with swiftly by Scion, Garlean, and Grand Company alike.
Even though Ramuh was a "benevolent" Primal, he was still a danger to the planet so long as he existed in our Plane, which is why he had to go. This is the primary purpose of the Scions of the Seventh Dawn since their inception organization - The Circle of Knowing. So saying they overlooked a Primal summoning of any kind, even by a small faction, is a bit farfetched. Especially considering Iceheart's band of heretics could also be considered a small faction.
So just be prepared for that. If a character can get past their disbelief or their fear of tempering, the next logical course of action would be to try to kill your character.
Warren posed some good questions to think about. I just wanted to bring one lore tidbit up in addition to all that. Primals, regardless of whether they are deities worshiped by a tribe (Ifrit, Ramuh, Leviathan, etc) or a reincarnation of some forgotten legend of times past (Bahamut, Shiva, King Moggle Mog, Phoenix, etc) a few things have to be in place for the Primal to persist.
1) Worship or fervent prayer to the deity or legend - which you've already established in your backstory.
2) Enough crystals to fully compose a corporeal form in the Physical Plane. The larger and more powerful the Primal, the more crystals are required. As you're a Lalafell, a smaller amount of crystals could likely create the form, however, a small amount of crystals will also ultimately make for a very weak primal.
3) Lastly, (and most tricky) because Primals do not belong on this Physical Plane, they must constantly absorb large amounts of aether from the Lifestream in order to persist. This is what I think Warren was getting at with the Scions of the Seventh Dawn. So long as your character remains summoned, she is effectively killing the planet. Which is why Primal summonings are dealt with swiftly by Scion, Garlean, and Grand Company alike.
Even though Ramuh was a "benevolent" Primal, he was still a danger to the planet so long as he existed in our Plane, which is why he had to go. This is the primary purpose of the Scions of the Seventh Dawn since their inception organization - The Circle of Knowing. So saying they overlooked a Primal summoning of any kind, even by a small faction, is a bit farfetched. Especially considering Iceheart's band of heretics could also be considered a small faction.
So just be prepared for that. If a character can get past their disbelief or their fear of tempering, the next logical course of action would be to try to kill your character.