kitetsus kill the weaker, all swords have their abillities
in the case of ace only a strong swordman can use it
in the case of ace only a strong swordman can use it
Yubashiri had no ability. Wado doesnt have one that we know of. Yoru doesnt have one either that is known.
And Roger's Ace doesnt have a known ability that is harmful to the user. WB's bisento is the same.
They might have some gimmicks or not, it's not clear if all of them are harmful or not.
For the sake of hype, they can be but so far only Kitetsus and Enma are known to be harmful swords.