Komachi's not too hard to get the hang of. f.5A and j.2A to confirm knockdown, then money shot to force graze or block on wake up (or if spacing is right, catch them full in the face). Then backdash, 5C->j.5C. Congratulations, you now have an awesome setup. If the enemy grazes your two 5C projectiles, you can j.6A or j.2A for a free melee hit and set up all over again. Or, if he makes it through you're projectiles, dash past him and 22B in the air to teleport him right into your still going 5C's. Odds are he ends up knocked down, which means...
Repeat.
Also, f.5A should be your general punisher at any range. If they make a bad move, punish with f.5A or if too close to do anything about it, dial A into NICE BOAT.