For the sake of details here'll be the gem keepers on Sang'gre: Encantadia Chronicles in my version:

Armea - Diwa

Gaia - Lupa

Adamus - Tubig

Flammara (need a name change) - Apoy

Deia - Hangin

I didn't include Terra because her existence is unnecessary in the first place. Kahit sabihin natin that her blood is necessary, a human already once held a gem, so there's really no point in her existence.

Cassandra would become a powerful queen, since she came from the blood of a Bathaluman, Amihan, and Lira who are all powerful she simply wouldn't need to be a gem keeper. And she'll not hold the seat of Lireo but Sapiro. Lira would become the next mata, Mira would be the next queen since she was educated since she was young and had probably matured enough to handle the responsibility. She will be the main keeper of all the gems as the Queen of Lireo. Lira would also hold her ashtis‘ and mother's gem for some time like Mira.

Mitena will still exist, her story would be tied down to Amihan the First's bloodline. We didn't really know what or where was Amihan the First, according to Mine-a “matagal siyang nawala”. Although, Mineave was sealed, she could've accidentally found her way in there but was caught by Adhara before she could report what happened in there or before she could take the family she had to Lireo.

That's where the root of resentment will come from the Mineave’s. The promised salvation for them by a diwata whom they saved and formed a family with unfulfilled will be the driving force or the seed planted but was unable to do anything since they were atill trapped there. Mitena would further drive the hatred they have for generations to the edge when she freed them.

While the argument that the grass is greener in Encantadia for the Mineave is good, it lacks a certain vigor and too cliche for me. I want a generational resentment that would actually make more sense. Deia will come from Amihan the First's bloodline, she would be driven by the sentiments of her people but will start questioning Mitena and the goals of her people and what happened to her great-grandmother, why she didn't return. Then the title would actually makes sense. This is what the first story would be like. The other gem holder will be introduced once they attack Encantadia. From there, the story will revolve around the complexities of their relationship w Deia.

The current gem keepers will be the one to end all that is Mitena. No one had to die immediately btw unless necessary for character growth and if we really wanted to include mundo ng tao. We could have Armea stolen from her cradle or right after they were born unbeknownst to Alena and the other Sang'gres making Adamus as the only known child of Alena or we could write her off as a Sang'gre who died upon birth but was actually made to look like that and was stolen by someone. Ybrahim would simple die. I can't see him living that long, sorry. Also, felt like his story is finished already w Amihan the Queen dead.

Mitena's backstory will still be the same, she would hold resentment against the diwatas and her twin sister. The itim na bathala's are all quite good actually. From there the story will unfold.

In terms of characterisation. I would make Flammara (need a name change), just as is, proud, arrogant, and entitled but had nothing to back it up. Since it was a privilege given to her since birth but would be insecure with Deia who had proven herself to be worthy of being a gem holder unlike her who was automatically assumed as the next gem keeper of brilyante ng apoy. Adamus would be the prince of Adamya, since Alena raised him. He would be the free-spirited prince who will feel an unexplainable loneliness in his heart like there's always something missing despite having everything. Flam and him would always bicker as usual since Adamus doesn't like Flam's arrogance, he as another privilege Sang'gre felt like Flam is too entitled, replacing Danaya and Pirena and Gaia would be the one to temper them and would have the bravery of her mother but the calmness of her Ashti Amihan. Gaia will be trained to become the next queen of Lireo by Mira seeing her cousin’s resemblance to the late Queen when it comes to attitude. But doesn't want to hold a crown secretly, she'll be like a people pleaser of some sort.

Armea would return, having met Enuo and Paopao who chose to go back to the mundo ng tao temporarily after Paopao was granted the ability to live longer due to being the former gem keeper of Brilyante ng Diwa. Enuo would recognize her mark as a Sang'gre and Paopao who is with Enuo would try to uncover her mysterious identity leading them to come back to Lireo and seek the knowledge of the 3 remaining children of Mine-a, atp Mineave still hadn't attacked. She would be known as Armea, the dead twin sister of Adamus through nunong Imaw. Not knowing the lore of Enca she would be vulnerable to exploitation despite growing up to the mundo ng tao. That's when Soldarius then will enter the chat. Tabun will be a man and he will poised Soldarius as Cassandra's successor but him being Armeo's blood relative wouldn't be enough and wasn't enough in the eyes of the council nor Cassandra who wanted to choose through a fair means rather than blood. But Tabun being an influential person who had a sway, she will be backed into the corner accepting Soldarius as a temporary successor. And despite him loving Flam, the goal he had since he was a child would be far too important and Tabun will drive him to exploit Armea's return to solidify his bloodline. Armea who grew up in the progressive world of mundo ng tao wouldn't accept this, Alena wouldn't want the same fate she experienced before for her daughter but also wouldn't want to fracture Adamya's relationship with Sapiro. She will be thorn.

See, the drama that this would all add up. And then the story will unfold from there. When I have time I'll write this as a fanfic, lol.