Question: why ichigo has hollow powers?
Answer: Hollow Ichigo is "born". While Ichigo underwent training to gain his own Shinigami powers, Kisuke Urahara put Ichigo's soul through a process called Encroachment in which if Ichigo did not gain the power on his own, he would become a Hollow. ... After three days in the shaft, Ichigo begins to transform into a Hollow.