hotaru
also don't get too comfy jumping over 4C, he does have a half screen j.C now.
my take on this matchup: at mid/long range unmagnetized, hakumen will destroy you with 4C and j.C. when he's magnetized he does have to be a bit more careful, but can still just mash hotaru and beat a lot of your shit. at close range, it's almost the same mixup game as ct, except you're at an advantage even when he's not magnetized due to gadget finger.
so yeah, just bring him to you (not the other way around), keep him magnetized if possible, and this shit is yours.