Full Name: Leonard Blank
Nickname(s): Leo
Birthdate: 16.08.1880
Age: 14
Gender: male
Occupation: fourth year student
Blood Status: Pureblooded
Residence: If he is not at Hogwarts, he lives with whoever employs him or takes him in out of kindness
Hogwarts House: Slytherin
Wand: Cherry, 10", supple, unicorn hair
Family: Leonard has no known living relatives. It is likely that he was born in rural Lithuania. However, he had a few benefactors who took care of him.
Most importabtly Quentin Blake -- the researcher and adventurer rescued Leonard when he was an infant and supported him as good as he, a single man in his 20s with little family to speak off, could manage. He is currently missing after a setting off to Russia for research.
1881 - 1887 -- a boy saved from the cauldron
In the summer of 1881, word reaches British traveler Quentin Blake that a coven of hags is terrorizing a village in rural Lithuania, stealing children and presumably eating them. The man sets out to free the peasants of that plight and indeed succeeds in routing out the beasts and killing them all.
One living infant is left in their den, already sitting by the cauldron. It is a quiet little thing with blue eyes. Asking around the nearby villages, nobody claims him. It is presumed that he must be of magical ancestry because there was a charmed amulet fastened to his blankets that wards off insects from stinging or biting the child.
Blake contacts the wizarding community in Lithuania and hands the child over. He is named Leonardas for his blonde, thick head of hair, resembling a lion's mane. He is put in the care of an orphanage in Vilnius, and his rescuer pledges to support him with a modest annual sum.
Leonardas has a right terrible upbringing at this orphanage, where the children are kept in line in a most cold and authoritarian manner, as is not uncommon at the time.
1887 -- Leaving Lithuania
Blake, who returns to Lithuania six years after the incident and visits the orphanage, decides that the boy was not as well cared for as he had hoped and takes him home to Britain. He is registered with the Ministry; the official there changes his name to Leonard and since no one had given him a surname and the official is severely lacking in imagination, he simply writes down "Blank" on his paper. And so, the person known as Leonard Blank comes to be.
1887 - 1888 -- living in Hogsmeade
Raising a seven-year-old as a bachelor who needs to travel a lot for his job and who has little money proves very difficult, but Quentin Blake tries his best to give Leonard an education and teach him the language and manners of English society. They move to Hogsmeade to a little pension where the old Mrs. Clawburn, who owned it, could look out for the boy when Blake was away.
1889 -- 1891
In January of 1889, Blake sets off to Russia for an excursion and does not return. No word reaches the pension about his whereabouts. To this day, he remains missing.
Leonard, who is of course terribly upset, remains at the pension. The ministry suggests taking him on as a ward and placing him in an orphanage or with a family, but Leonard is terrified of going to another group home and reacts to all these circumstances by becoming very sick.
Due to his fragile health, it is decided to leave him at the pension. Mrs. Clawburn agrees to care for him until his health improves. She is not cold-hearted but very pragmatic.
Blake's money soon runs out, and she tells Leonard that he has to start making himself useful if he wants to stick around.
He starts working in the kitchen, feeds the chickens, and serves tea to the tenants.
Since he has a beautiful voice and attends the choir, he starts singing in the streets for some extra money.
Soon he is noticed by some sentimental older ladies from the community. He starts working at their houses, singing at their tea parties and bringing them their slippers.
They find him droll and give him cake and new clothes when he needs them. Slowly, he builds connections in the community, who become all he has going for him. So he gets on and gets around until it is time to go to Hogwarts.
1891 - 1894 -- Entering Hogwarts until today
The shy boy starts school and is surprisingly sorted into Slytherin. He struggles because his education since Blake's absence has been subpar. When he enters Hogwarts, he's functionally illiterate. This improves over time, but he masks his deficiency by having others write his homework in exchange for favors or by employing his little network in Hogsmeade to send treats and other bartering goods by owl.
By fourth year, he sort of writes and reads a little, but his comprehension and spelling still lag way behind his peers and he frequently uses a very smartly disguised magic feather to complete essays, which might lead to trouble later on. He compensates with his excellent memory and auditive learning skills.
In 1892, Mrs. Clawburn dies of old age, leaving Leonard more or less homeless—were it not for different people across Hogsmeade stepping up to take him in for summer.
More than ever, Hogwarts becomes his home and respite, and he's terribly scared of one day having to leave it.