A Melody of Shadows: The Transformation of Dylanaius into Ferid Bathory

Question: Write a transformation story of Dylan The Dylanus (an original character made by the Deviantart user Dylan613) turning into Ferid Bathory (from the Seraph of the End/Owari no Seraph anime series), complete with clothes change, age progression, height progression, and mind/mental change (with Dylan's personality and memories being completely replaced with Ferid's personality and memories, despite his fears and efforts of fighting back those new memories and personality, making him completely forget that he was a teenage mortal boy Dylan and only remembered ever being a vampire named Ferid Bathory). For Dylan's appearance, he is a 4.9 foot tall, 15 year old boy who has a lean build for his size, tan skin, medium-length brown hair (that reaches his chin, although not covering his face at all), and has green irises. He wears a dark blue hoodie, a lighter blue t-shirt underneath, and cyan wear jeans. He also has white socks underneath his black tennis shoes, which have an x-shaped gray marking on each of his shoes' tongue. Dylan is a kind, considerate, smart, and understanding character, who is a love interest to Emma (his girlfriend) and is playful around his slightly older, smarter brother Black. Despite his small frame and being a teen, he goes in the way to protect his homeland against various villains and monsters (always successful, even if some are more difficult than others). Despite these traits, he does have some flaws, such as his intolerance to swearing (which aren't present in his homeland), being quite weak without superpowers (which he actually does not have and only obtains them when using special devices), and has fear of vampires and demons alike since he views them as nothing more than pure evil monsters. For Ferid's appearance (after Dylan turned into him), he is a tall and slender male (182 centimeters tall) with a rather handsome appearance. He has long, waist-length silver hair with bangs and a lock of hair over each ear. Like all pure vampires, he has red eyes and pointed elf-like ears. He also wears red diamond shaped earrings. Ferid's attire as a noble is composed of several components. He wears a white long-sleeved shirt with a decorative cut. It has a black line with dark gray rhombi intermittently dispersed along it. There is originally a stripe on his left side as well, but this disappears after Krul defeats him. The cuffs off the shirt are black and with a pair of gold colored lines around the wrist cuffs with three buttons. White lace ruffles comes out of the cuffs over his hands. He wears white gloves. Ferid wears a white cape with a decorative cut over his shoulders and arms. It reaches to his waist in the front and down to his upper thighs in the back. The cape has black shoulder details as well as the black vampire insignia on the left shoulder. It also has two black buttons on the right. A gold ring connects to the vampire insignia and is attached to a chain running under his ruffles. There are some gold decorations hanging from this chain. There is a wide dark gray strap beneath this cape moving from his right shoulder to his left hip. This has three strips running down it with a small mark over each stripe at set intervals. The collar is decorated with a scarlet bow at the base of his throat. The tails of the ribbon reach his waist. Two layers of white ruffles are present beneath the bow and reach his mid-chest. Ferid also has a white waistcoat he wears over his posterior. It is split down the center and reaches his mid-calf. It is held in place by a wide black belt with a large buckle. The buckle rests over his left hip. He dons a pair of white pants and black boots, which reach his upper thigh. The boots have three golden buttons at his thigh and three at his calf. The boots are darker at the toes, and heel. A pair of small black ribbons meet over either heel and are kept in place by a small white button detail in the center. He has a courteous manner of speaking and he is carefree when interacting with others. When the opportunity present himself, he will place himself in a physical higher position than those he is speaking to. His pleasant manner of speaking extents to those he murders for Ferid has a deviously sadistic streak. He kept a map around for Mika to find and after waiting for him and his family to reach the exit and escape, Ferid appeared and first enjoyed the loss of hope that he could identify in their faces then set about systematically killing a number of children. His entrapments cover his allies as well, he later reached the point where he said the queen of Japan could not kill him or the progenitor council would learn of her illicit activities. He would include other accomplices in a list of assassination targets he gave to the humans to avoid others suspecting his involvement. In a fight with those who have the means to damage him, Ferid remains largely unbothered. Provoking a vampire much stronger than him and losing an arm did not fully deter him right away although he says losing an arm hurts (he effortlessly reattaches his arm afterwards and is functional again once reattached). On a battlefield he directs units to specific targets but largely observes, only intervening if it requires his capabilities. He blocked an attack aiming for Mika, and antagonized Yu to draw him away from his squad for Mika to get. A scenario such as the presence of the Japanese Imperial Demon Army instilled anger in him and he retreated from that.