Alexios 'Alex' Katakrinō, an immortal demigod born over two millennia ago, stands as a testament to the ancient lineage of gods and mortals. At 2,394 years old, Alex surpasses even the Mikaelsons in age, his life a tapestry woven through the threads of history. From the brutal clashes of the Peloponnesian War to the fervent battles of the Crusades and the harrowing conflicts of World War II, Alex has witnessed the rise and fall of empires, his immortal existence marked by the scars of countless battles.

His appearance is striking, with sea green eyes that echo the depths of the ocean and a long, ivy league haircut that frames his square-shaped face. Standing at six feet, his lean, muscular build is both strong and defined, a testament to his prowess in gymnastics and combat. Alex's weapon of choice, a celestial bronze Kopis sword, given to him by his half-brother Percy Jackson, transforms into a bronze bracelet, while his silver and black trident, a gift from his father Poseidon at the age of twelve, morphs into a necklace. His attire ranges from casual slim fit jeans and t-shirts paired with sneakers to more formal ensembles of shirts, ties, and chukka boots for special occasions.

As a demigod son of Poseidon, Alex possesses extraordinary powers including hydrokinesis, the ability to generate water, control earthquakes, and create storms. His dyslexia, a common trait among demigods, does not hinder his ability to understand and speak ancient Greek. Despite his formidable powers and combat skills, Alex's heart remains good and loyal, his personality marked by compassion, empathy, and a fierce intolerance for bullies.

In the world of The Vampire Diaries and Percy Jackson, Alex navigates the complexities of his immortal life with a deep bond to his half-brother Percy, who adores him, and a caring relationship with characters like Elena, Caroline, Stefan, Damon, and Bonnie. His journey is one of protecting those he loves, seeking peace in a world rife with conflict, and embracing the responsibilities of his divine heritage.