Fumiaki
darn.... he/Zoro really doesn't need any curse energy because his haki and his mastery of it is actually enough ..haki is fighting Spirit's and will's manifestoation... It can damage and kill (if the need arises) any intangible or ethereal opponents .. it might not stated in canon but I believe that haki is empowered by spiritual energy and that is more than enough to go toe to toe against cursed spirits and sorcerers... darn... with his observation haki he really don't need to see and with his armament haki he can "CUT" those spirits... Can't wait when his Conquerors Haki is in use