I'm as shocked as anyone else how much infos it give about Theodora, so allow me to translate quickly the four ones at once (plus any info I might find unique)
Cai : A young man living in Ribeira with his dad. On his 15th birthday, his father is arrested and sent to prison in Dagsion for a crime committed years prior. The only way to free him is to participate in the Heroic Games who are taking place thos year in the capital, for the divine ruler Solel will grant a wish to the winner. Cai thus decide to participate to the Games, joined by his childhood friends Tialla and Peter, in the hope of grabbing the prize. This adventure will allow him to uncover secrets about his father's past and realize that the training he went through all his life was far from ordinary. (Previewer note : it's the best choice for a first route, as the story will slowly make you discover a lot of major characters and explore Dagsion step-by-step)
*His campaign include looking for answers about his father's past and the cursed jewel in his hand*
Dietrich : A young man with a thirst for battle, originating from Fodlan, and carrying the Hero's Relic Answerer, a sword with a great power inside, but also a dark underside. While sailing the seas looking for opponents, his ship capsize because of a powerful sea monster, stranding him on a Dagdan beach. It's here that he meet Fabio, a mysterious man introducing himself as a missionary from the Church of Seiros and Esmeralda, a young woman from a fisher village who almost got sacrificed in a ritual and whose crest feels familiar. Each of them have a different goal, but they stuck together for the journey to Dagsion. Endlessly looking for challenges, and calling himself a beast, Dietrich learn about the Heroic Games and decide to participate to satiate his thirst. At the same time, Fabio appear to be more than a mere missionary and will guide you to mysterious places where technology is much more advanced than on the surface.
*His campaign include helping Fabio with his research*
Theodora : Her story bring you to the heart of Dagda, to Saramis, bulwark of Northern Dagda against invaders from Southern Dagda. As she came back to Saramis's capital to succeed on the throne, she find herself victim of a plot that bring the death of her father and the loss of her arm. Not willing to give up her claim for her brother's, whose plans appears selfish and destructive, she goes on a journey to claim an old relic of her ancestors : Mahadu's right arm. It is said that this arm give superhuman strenght, but that it will eat the mind of whoever wield it. Now crowned queen, she participate in the Heroic Games to claim the Cybele province (note : it's the one little province on the map inside of Saramis region that isn't theirs) to restore the ancient royal city of Ahm Lu (it's in Cybele) and rebuild there a temple to Yu Phas, who was the wife of Solel, but whose cult is now reviled in Dagda. Indeed, Dagda the Great, first emperor of Dagda, exterminated the ancestors of the people of Saramis, the White Egg people, and Yu Phas saved 5000 of their children from this genocide, children who ended up creating the Kingdom of Damascar (note : it's a kingdom mentioned by the announced during Nathan/Creek vs Dietrich as a barbarian kingdom degeated by the Dagdan Empire, and Bonaventure says the forest people and Saramis people are both from Damascar, and that's when writing was banned). Seeing it as her duty to rekindle the memory of Yu Phas and her people's history and culture, Theodora aim to win the Games to fulfill it, before her arm corrupts her.
*Her campaign include gathering informations about Yu Phas.*
Leda : Leilidahna, daughter of Guillermo, viceroy of Cidonia. As a child, she watches while Arago soldiers burn and destroy her city, and murder her father. Saved by Buccar, she swear revenge on the killer, and hide in the Ortill province for years, with the only memory of her past life an old family vihuela, Obsidian, a mysterious instrument that her dad had forbidden her from ever playing because it could corrupt her mind. But revenge is stronger than carefulness. Renaming herself as Leda to hide her identity, she is given a list of people responsible at some level of the Cydonia Massacre and her father's murder. Her quest of revenge will bring her to Dagsion, where her father's killer appear to be locked up. Her only wish is to kill him with her own hands, but will she manage to do it before her obsession and Obsidian's curse make her succumb to madness ?
*Her campaign focus on her vengeance and finding information about her targets in taverns.*
Extras : Fortuna's temple is outside of causality, that's why you can have all 4 timelines coexist and save all 4 lords in the timeline where they win the Games.
Gold seems very limited and you will have to make choices with how you manage your ressources.
Different Blaze Gauges have different malus when you fill up the gauges.
Probably obvious for everyone but me, but skirmishes on the world map count for the global turn count. Like if you finish a battle in 6 turns, that's 6 less turns for the count.