Jehan is quite small and slight, almost with an air of fragility around him. His hair is dark brown, with a tendency to curl if left long. He often has a somewhat faraway expression, as if he is contemplating some other reality to where he is (which is often true).
Background
The Irish-American Callahan family have been amongst pureblood society for centuries. They arrived in America in the 17th Century from Ireland, along with many other magical and muggle families. Originally settling in Massachusetts (as did many Irish families), this particular branch of the family have since moved to Idaho, preferring the open spaces that are to be found in one of the least densely populated states of America. Another benefit of moving to Idaho was the Callahan’s move into the gemstone trade, particularly star garnets, which has increased the wealth of this particular branch of the family.
Whilst encouraging responsibility and a sense of decorum, the Callahans do not expect completely perfect behaviour from their children whilst at home (unless, of course, visitors are staying). It is only in the wider world that they are expected to behave in a way that benefits their family. Behaving in a way that benefits the Callahan family means mixing with the right people, not getting too friendly with the wrong people, and, eventually, finding a nice pureblood of the opposite gender to marry.