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In Akan spirituality, the kra is the soul of a person. It is of divine origin; that is to say, one gets their "Kra" from God (Nyame/Niamien).
An Akan conforms to the abusua/(Mogya (blood)) of his mother, and receives the Ntoro from his father. These maternal and paternal bonds follow the Akan wherever he/she travels. An Akan's Sunsum is their Spirit/personality which they develop through their interaction with the world.
References
Gyekye, Kwame; African Philosophical thought: An Akan Conceptual scheme, 1995
Leipzig Antubam, Kofi; Ghana's heritage of Culture, Leipzig 1963