Some questions about your FantasyAU involving a few shipping what ifs. How would Ellry, Stickvin or Chestick work?
Stickvin would have to have King Henry not be a king at all, but just some guy that was found as a baby and taken to the orphanage where Charles and Sven would canonically grow up in.
Henry and Charles become a thing when they are old enough to leave the orphanage, with Henry staying at the main office of The Skies and Seas to keep things clean while Charles and Sven deliver mail.
Though without having ever adopted Henry, King Wilford slowly grows more violent due to the stresses of being king and all the wars happening, eventually causing the Toppat Kingdom to crumble. Righteous goes on to be a hired mercenary and Sorcerer Reginald is killed trying to avenge Terrence.
Violence and darkness eventually run rampant in the land of Mesa, with The Great Corrupter returning to bring about a new age of corruption.
Ellry would have Ellie meeting King Henry when he would still be a Prince, the two getting to know each other and Ellie not being too judgemental on Henry not wanting to choose violence to solve problems.
Eventually the two fall in love and when Henry becomes King, Ellie becomes his Queen, helping him rule the Toppat Kingdom.
But soon Righteous would show up and become friends with Ellie, sparring together and just doing stuff together that she couldn't do with King Henry.
Ellie soon realizes that while she does care for Henry, she doesn't truly love Henry, and eventually helps Righteous with his plan to overthrow the Toppat Kingdom.
Ellie intercepts King Henry but instead of killing him, she hands him her wedding ring and tells Henry everything that she was feeling. Ellie then gives Henry one last kiss on the forehead, telling him that she was sorry and to never return to Toppat Kingdom, using a teleport crystal to teleport Henry far away.
Chestick is... how you get King Henry to go through a corruption arc. You want a fucked up and evil Henry, well Chestick is how you get the cinnamon roll to go feral and evil.
Henry is found as a baby and sent to the nearby Magic Academy. It was supposed to only be temporary, but the staff had grown to care for Henry and they officially took him in, with Terrence soon adopting Henry.
Henry and Reginald got along as brothers, but Henry soon became friends with Thomas Chestershire. And as the years went by, Henry grew closer to Thomas and soon the two were quite the couple.
And when Thomas suggested that they overthrow Terrence and take over the Magic Academy, Henry was more then happy to help, frustrated that Reginald seemed to always be better then him and wanting his father to just notice him more.
The coup went well and Henry sealed Terrence and Reginald in crystal, still being a pacifist when it came to fighting. The crystals were teleported to a random place in the world, with Randy and Dr V finding the crystals and working to eventually free the trapped men.
Thomas becomes the new Grand Mage and Henry becomes his second, with a few things happening from here.
The two rule the Magic Academy with an iron fist, with Henry gleefully sealing anyone that opposes him or Thomas. The world eventually falls to The Great Corrupter, with Thomas and Henry becoming corrupted with it's magic and becoming far more dangerous.
Terrence and Reginald storm the Magic Academy and in a terrible accident, Henry is killed in the crossfire, with Thomas destroying everything in a grief fueled rampage.
Terrence and Reginald still storm the Magic Academy and the accident still happens, but Henry is only knocked out and Thomas is killed. Henry wakes up to having no memories of who he or anyone was.
Terrence explains only the basics to Henry, that he is Henry's father and Reginald is his older brother and that a terrible accident happened to him. Henry asks if it was his fault, with Terrence hugging his son and telling him that it wasn't, secretly casting a spell that would prevent Henry from ever remembering his past and his relationship with Thomas.
Terrence works hard to be a better father to both Henry and Reginald and Reginald works to be a better brother to Henry. Henry isn't quite sure why some people in the Academy look at him with fear, but he is far sweeter kinder then the Henry that was in love with Thomas.
