Blank Slate was originally a member of the Point Men, a group who battled Young Justice.
His powers allowed him to match whomever he faced. When fighting Secret, the two appeared to be a swirl of wind and smoke. When Superboy attacked him, noting that he should win because Blank Slate wasn't super strong, Slate replied that he was "only as strong as [Superboy]."
Later, the Point Men abandoned the agency that had created them. Blank Slate and the rest of the group became reserve members of Young Justice.