Isshin Kurosaki

He is the father Ichigo Kurosaki.In the american manga he is shown as a soul reaper but it is not known if he is a current soul reaper or if he used to be. When he finds Kon being attacked by the grand fisher. He stops him and tells kon that he knew who he was since the first day he saw him at his wifes cementary. He also says that is why he never called him Ichigo. Currently shonen jump ends with him slashing thru the grand fisher in his arrancar form but it is still known if he kills him or not. Maybe thats why he usually is fighting Ichigo because he still has the fighting spirit in him of a soul reaper.