I do not own the character are owned by the writer of Harry Potter and Katekyo Hitman Reborn. This story so far was co-written by several other people and subjected to be re-written .Please comment if any of you readers notice any inconsistency because this is my first story.
Chapter 1: The beginning.
Nanamori, Japan
October 14 two children are born to Iemitsu and Nana older of the twins is named Tsunayoshi and the younger brother Tatsumi. Tsunayoshi bore the same skin color as his mother as well as possessing honey brown eyes and brown hair, and a striking resemblance to the first boss of the Vongola "family". The Vongola is the Most powerful Mafia famiglia in the brother also bears a striking resemblance to their father with dirty blond hair and muddy brown the proud father had a secret he chose not to share with his naive wife which was that he is the Outside Advisor to Timoteo who is the Ninth boss of the vongola and also that he and his two sons were the last direct descendants of the founder of the Vongola family.
2-3 years later
Tsunayoshi (or known by his nickname Tsuna) is sitting in his trundle bed all seems well, however, within him his two hidden forces of magic and soul elementals(known to his father as dying will flames) begin to collide, causing the two year old to exhibit symptoms of magical exhaustion that the parents do not know or recognize His parents, worried for their oldest child, take him to multiple top specialists(not the mafia one because Iemitsu did not want the news of his family to get out) but none of them can provide any answers as to what is plaguing the child and causing him such agony. After a long while of searching and worry, Tsuna's father learns that he must leave to continues his duties as Outside Advisor, and since his wife is unable to care for both the sickly Tsuna and his younger brother they decided to give Tsuna up for adoption. What the Sawada's did not know is when a magical child is given up the muggle records of said child is erased by the Ministries and adopted out immediately to magically compatible families. Also the Mafia and the underside of magical world know of each other but they do not interfere with each other much.
At three years old Tsuna was put in the orphanage by his parents and the Japanese Ministry finds reasons for his symptoms and there are only several others that are just like him. They classify him as a mage. The adoption to these compatible families or bloodlines stops the competition between the two energies residing within the child and helps bring it back into balance and negate the detrimental symptoms. The Ministry brings in the goblins to take a blood and magic sample from Tsuna to find a compatible parent/s to raise and adopt him.
The special doctors from the Ministry entered the room with a stout goblin with a very grim continence who had a special needle made specifically for not only extracting blood, but also magical essence from any creatures, man or animal that possess magic and keep the samples in a special secret wing of Gringotts. The doctor, who identified herself as Sakura Yamada from the Japanese branch of the Ministry of Magic and her associate Redclaw who manages the secret wing of Gringotts that keeps the samples for magical beings and both work for the welfare of magical beings.
Sakura brought Tsuna into the medical office and puts him on a bed where Redclaw could prick the toddlers finger with the special hollowed out needle that can extract blood as well as magical essence and puts it through a ritual that determines possibilities for parents that have a similar essences of the child. This system was made after the war in Britain when Voldemort's (aka Tom Riddle) and Harry Potter past was revealed to the five years later in order to prevent another dark lord and protect the Statute of Secrecy they had every magical child to be subjected to a test at seven years old and to determine if the parents are treating the child right. It is used for younger if a child is abandoned and due to Tsuna circumstances which he is a mage a more thorough test to determine a matching guardian to save his life by stabilizing his flames and magical core. Through this method children would find the families they deserve, and the world would not see the rise of another tyrant who threatened the stability of both the magical and muggle world.
The goblin pricked the finger of the toddler to get ten drops of blood. Tsuna, surprisingly did not cry or fret, and Redclaw placed the blood from the needle into a metal bowl which removes the impurities from the child's essence and walked over to a stone table that was 3 feet by 3 feet with round circles pressed in the stone on each of the four corners which has a stone basin in the poured the blood sample from the metal bowl into the center basin and five minutes later the goblin pressed the needle into each of the four corner to release the magic ritual was done because the child has flames the essence is different from a regular wizard and it determines the right person/s to be given custody of the toddler mage. There was a huge flash which the goblin and the healer were expecting that signifies the childs essence found a match. The name that appears in the bowl surprised the two adult magical beings present. Tsuna's match being the defeater of the dark lord at the battle of Hogwart five years ago, the hero of the wizarding world Harry James Potter-Black.