Cancers get along well with mutable signs due to the quick changes in their moods. The Cancer understands how flexible a mutable sign’s mind can be due to the flexibility of their own mind. They understand that no one is stagnant and that we are ever changing. A Cancers mind is a blatant example of the roving mind. Who better to understand that then a mutable sign and vice versa?
You used some Japanese pictures in your Mulan edit :(