[Disclaimer: The picture above is not my real face. It was the one that has the closest resemblance to the appearance I imagined for the character.]

Appearance
Allen has a fair skin with his hair colored brown. His face is smooth with no freckles and has a pair of eyes with black pupils. He sometimes forgot to comb his hair properly which makes his hair appear messy in some instances. He is also slightly taller than other boys his age.

Mental/Personality:
Allen is known as bright, hardworking, warm-hearted, and earnest. He's a bit timid, but also curious. He is also shown to be interested in many events and enjoys learning new knowledges with high concentration. Sometimes a bit too much. Allen can be clumsy and can be socially awkward sometimes. If pushed far enough, he can be stressed out or pissed off so easily. And despite his meek and reserved nature, he harbors within him a quiet courage.

Biography/Background
Allen grow up as a half-blood wizard. With his father being a Muggle-born and his mother an american pure blood. His parents actually met as a kid and ends up on quill-pal term. They kept secret about them being a wizard as much as too keep the secret about the wizarding society. But it's only after his father's one year transfer to Ilvermorny that they found out that they both are wizard/witch!

Allen was born around three years after his parent's marriage. Despite technically being a nobleman through his mother's side, He grew up as a humble young man and a very social kid. In home, he often spend his time read books and drawing as a hobby. And he took pride in his lineage.

First Instance of Magic
It happened when he was five years old. It was a cold and heavy rain. There Allen was. Nestled in his bedroom looking at every corner on his room. And when a loud lightning strikes, he was shocked that he made the door and windows shut on its own.