name the fictional character who was in harry potter and portrayer is harry potter and the half-blood prince ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_series dbr_Harry_Potter sep_dot var_uri dbo_portrayer dbr_Harry_Potter_and_the_Half-Blood_Prince_ attr_open film attr_close sep_dot var_uri a dbo_FictionalCharacter brack_close