Oscar: pronounced oss-kerr is a name originated from Ireland.
Chandler: pronounced shand-lerr
Reus: pronounced ray-yus comes from a German footballer Marco Reus.
Oscar is a sarcastic, furtive and secretive wizard. He is prejudice, meaning, he considers a rule against Muggles, Muggle-borns, half-breeds and squibs, very strict into blood purity. He is slightly arrogant, but modest at the same time. He is used to being alone without a gang to insult first years. He is very clever in most subjects especially DADA (Defence Against the Dark Arts), and knows many spells, jinxes and hexes he tends to use on people but avoids to, in case he gets expelled. Oscar is willing to become an Auror which he has the required characteristics to qualify. He is also extremely cunning.
Early History before Hogwarts
Oscar was born in Wool's Orphanage in the first of October, 2003. He was named Oscárius Chandler Reus, however, most of the fellow Muggles in the orphanage call him Oscar. He was different. He could make his bullies pay the price by hurting them and he could sneak away from someone with a blink of an eye.
One day, when he turned eleven, as usual a Hogwarts Professor comes to a Muggle place and tells them about Hogwarts if they are not aware of it, so a Professor arrived at Wool's Orphanage to escort him to Hogwarts and give him the list of supplies he needed to have and how to enter Diagon Alley. However, Oscar did not want him to come along. He wished to do his shopping alone. So the Professor elaborated about how to get into Diagon Alley and what he needed and went away. Leaving Oscar alone until the first of September.