What are characteristics of a fief?

physical characteristics of a human is your phenotype

something that describes someone

Well, a typical "he" will be male. In human, this means that "he" will produce hormone testosterone and not estrogen which is what "she" will produce. Also, "he" will not have a mammary glands...

A fief was a parcel of land held by a serf. It was given to him by his overlord, and the serf was required to work it and give him a share of his crops every year.

A fief is something real or tangible given for loyalty by a person of higher rank or status to someone to retain loyalty. It was usually a plot of land, and it might be accompanied by a title, rank...