He is a 4 foot 9 inch individual with brown hair and blue eyes, and he is skinnier than average.
He loves to build structures with scrap wood and materials lying around, and he loves reading as well. His teachers praised him as very creative, and he got top of his class in English. He aspires to become a builder in the wizard world, disguising cool-looking buildings where important people work at, in the Muggle world (much like Diagon Alley or St. Mungo's Hospital).

Jacob's dad is a wizard, occupying a prominent position in the Ministry of Magic. His mom is an accountant at a bank run by Muggle company Wells Fargo. He found friends while on a trip to London, and he visits them by train every so often and spends weekends and holidays in London, watching their parents perform magic. His house is a small townhouse, enough space for him, his mother, and his father. He has no siblings, but he has always been a bit quiet around other people, especially if they are Muggles.

His first act of underage magic happened when he was 7. Some Muggles came over to stay at their house for a night, as they were set to travel with his mom. Along the way, their bossy kid started beating him up, and then suddenly they were thrown against the wall.