Every genius is unique.
However, there are some features that many learning geniuses that I personally knew had in common. Some of the strongest I met were female. Every learning genius has a very strong interest in one or more subject that helps the learning abilities to develop initially. Of course, later a learning genius is able to use most of his abilities to study other subjects, even if they are not of immediate interest to him. But none of the supersuccessful learners I met have developed the abilities on subjects that were not interesting to them.