Hakumen is like, rock paper scissors...sorta. He's kinda like the Tager matchup, just think Tager has an air dash and good normals now. Play cautiously and stay the fuck away. Sit full screen whenever possible, don't rush him without cover. If he cuts a projectile and decides to just camp behind his barrier, big deal....when he does that I feel like just letting him get the meter from camping and using the time to set up more steins. Plus you can dash in a enough to set up 6Ds behind the barrier anyways...so he's can't reliably hide behind it forever, cause you can still detonate them if he doesn't hide completely in the barrier.
Lasers are mostly not that good against him, but explosions are. the 6D > 4D > 214D setup is good for him, cause he's so big.
Also 2C is good here, since he likes to approach from the air. Knock him out if he tries to jump in on you. Keeping him blocking and cautious is the best thing to do. Hakumen versus Mu is a staring contest almost..or at least, thats what it feels like to me. Both can sit comfortably full screen and wait till the other has a flaw in their defense and then take advantage of it.
As for Litchi...we don't have one in our scene...so I can't help you there. ^^;