Good news everyone, the concepts for the CYL winners have been solidified.
Dimitri: Brave Reaper. Cavalry Axe. The Tempest King won. He never deserved it. The voices still haunt him. So many terrible people still run free. Fodlan continues to be plagued by outsiders invading, and cities are being destroyed by unknown means. By now Dimitri has given up and fully embraced his true nature, a wild boar that knows nothing but killing. With Edelgard's axe and the Death Knight's armor, he roams Fodlan striking down anyone he deems unworthy of living.
Edelgard: Brave Saint. Flying Blue Dragon. Fodlan is ruled by a corrupt church, and with the people blindly devoted to it there is no hope of breaking its grip on the continent. Thus to free Fodlan from the church's tyranny Edelgard subverts the church in her favor, declaring herself the true voice of the goddess. Her coup is completed when she hunts down and drinks the blood of Seiros and the four saints, giving her the power to control the church and even the ability to turn into a new Immaculate One.
Claude: Brave Bandit: Infantry Sword. Claude has always been an avid fan of history, but perhaps greater attention should have been paid to who he studied. With a smile on his face he became the dominant power in Fodlan, striking down all the evils that lurked within it. That is until he defeated Nemesis and claimed his Dark Creator Sword. From there his true nature has been revealed as just one big troll who played everyone for his own amusement. Backed up with a terrifying weapon and the descendants of the 10 Elites, Claude becomes the new King of Liberation, raiding and pillaging the entire world as he pleases.
Lysithea: Brave Hegemon: Armor Colorless Beast. Those Who Slither in the Dark wished to use the power of crests to create the most powerful weapon in history. They succeeded. The experiments on a young Lysithea granted her immense physical and magical power. She used this power for revenge to slaughter their leadership and take control of the group for herself. Her experiences taught her that only she deserves the right to lead Fodlan. Continued work on her gave Lysithea the ability to take an unstoppable monstrous Hegemon form, which she uses to force the entirety of Fodlan to bend to her will. Sweets are only the first of many tributes she shall demand.