PERSONALITY

History

David was born Theodore Blake (Slytherin).  For reasons explained later, he changed his name to David McKay (Hufflepuff) and his age to thirty-nine instead of fifty-one

Early Life
Young Theo was born to two pureblood wizards, and the instant he was born, they knew he was special.  His eyes changed colors - at first his parents thought it was a trick of light until he managed to give himself a duck face during one of his early lessons from his parents.  He was brought to St. Mungo's and that was there they told them of his power.  Given it was rare, they weren't sure how to handle it.  At first it was small changes, but as he grew up, he managed to make more complicated changes - unlike most metamorphagus, he had issues changing his hair color.

Hogwarts years
Theo was sorted into slytherin right along with how his family usually went.  Of course in his year, if one does the math, he went to school with a boy named tom.  Theo wasn't great friends with him - he found the kid to be a bit odd.  regardless, they were both slytherins, and he found they were both highly intelligent.  Unfortunately for Theo, he didn't quite agree with a lot of what Tom told him he believed in.  However, they were on agreeable terms.

Early out of hogwarts years
Theo became an author and traveled the world writing about the different peoples he met.  However, during one of his stops in britain, he was approached by tom, his classmate.  He was recruiting for an organization which he called the death eaters.  Theo politely declined.  tom was very unhappy about it, but the two parted ways.  theo returned to england not long afterwards in order to care for his mother who had fallen ill.  

Later out of hogwarts years
unfortunately for theo, his father fell ill soon after as well.  he researched ways to help the two of them - but they eneded up dying just days apart from each other.  the authorities, however, suspected foul play, and found they were poisoned.  theo was arrested for the murder of his own parents and quickly found guilty despite it not being him.  Sure that it had been tom for his rejection to join his little band of goons, theo escaped on the way to azkaban - not actually from the prison itself because that would be pretty much impossible.  

he investigating it a bit further so he could know for sure who it had been, instead of just a hunch.  After that he planned to confront who did it - even if it was tom from his school years.  while on the run and investigating, he met a young auror named david mckay.  david caught theo one day, but he was willing to listen to theo's plea.  the two agreed to help each other to find out who truly killed his parents - david's parents had been murdered when he was young too, and he couldn't imagine being blamed for it.

the two became fairly quick friends and worked together on the case.  theo began to mimic his appearance in order to go out occasionally.  However, one day the death eaters found david, and therefore found theo and a fight broke out.  the death eaters were fought off, but david ended up dead.  theo took this chance, while he was extremely sad that his friend was gone, he was a convict on the run - david was a well liked auror.  

burying david in david's backyard, theo took on the name and history of david mckay.  this year dumbledore requested a new dada professor - he'd heard how tom, or as he was known now, Voldemort placed a curse on the job.  he felt almost an obligation while the ministry sent a few candidates to dumbledore for him to possibly pick from if he couldn't find anyone else.  'david' volunteered for the position - he almost felt an obligation for it.

When he talked to dumbledore, he got the distinct impression that dumbledore knew everything that had happened, and he was offered the job.  he had no idea how he could know, but he felt like he knew somehow.  either way, here he was, the new professor, posing as an auror.