Jay is an 11-year-old boy, quite tall for his age. He has messy blond short hair. His eyes are a striking cyan blue and they are slightly almond shaped. He has a thin nose. His lips are pretty thin too. He has high cheekbones. His muscles are starting to take shape. He has a confident walk and seems very sure of himself. He is rather smiling although he can also become cold and distant very quickly.

Jay is apparently a rather happy boy. He is open and easily reaches out to others. He is very confident and speaks well in public. Internally, it's more complicated. He is quite tormented and judges himself severely. He wants to maintain this image of serenity at all costs. It has to do with the education he received. You don't show your feelings when you're a Whitehill. He has great difficulty in trusting and does not let anyone enter his bubble.

Jay comes from a long line of affluent wizards. Her parents, Hudson and Judith Whitehill, are very proud of their origins and hate Muggles. He has a big sister, three years his senior, Sienna. They love each other very much. He feels like he's the only person who can really understand him. They spend a lot of time together and tell each other everything. Jay has always lived in the beautiful and imposing home of the family. He received a traditional education, having many home tutors, he never went to school. He has a few wizarding friends of his age, all of them pureblood, his parents very fond of entertaining. Jay doesn't believe in pureblood superiority, but he would never dare admit it.

During his first instance of accidental underaged wandless magic, Jay was seven years old. He had seen his father cast the aguamenti spell to fill the fountain in front of their house after it had been cleaned. Jay wanted him to try too and asked his father to lend him his wand. Obviously, the latter refused. This angered Jay so much that all of the water in the fountain rose into the air like a tsunami and fell on Hudson and his son.