I've been using the cutter line of swords a lot recently. I find that they are actually pretty good swords if they are used properly. But, their charge attack is terrible because it leaves you wide open to attacks. In fact, the cutter's charge attack is its basic 5-hit combo, but without any movement. I think it could use a better charge attack.

So, I suggest changing the cutter line's charge attack to a rush-in type attack. When you unleash your attack you will dash to your mouse cursor. Any enemies that are close to the target location will get knocked down but will take no damage. Using the charge attack will count as a normal swing of your sword. This means that after you use the attack you can hit the enemy up to 4 more times. It will take a short time for your character to recover after the attack. This means that you can't immediately shield after using the attack, so you have to use the attack with care. (Yeah, I got the idea after playing League of Legends for a while.)

Of course, you should not be able to use the attack to dash over walls, through gates, or across chasms. Also, there should be a max range on the dash, so you can't dash across the screen with a 2* cutter. (You might be able to with a 5* dread venom striker though.) Further, some large enemies (like trojans, lumbers, and bosses) will be immune to the knockdown and interrupt affects of the attack.

This charge attack will also go well with the lore of the weapon. It's supposed to be an assassin's blade after all. (: