|Kaze's stats let him do multiple things at once very easily, especially since he has a dagger. Going down the line:
Kaze's natural Barb Shuriken+, while losing out to the Kitty Paddle when it comes to erasing mages, does far better for engaging every other kind of foe, replacing raw damage with unrivaled versatility. With the Res forge and Mirror Strike 2, Kaze's Iceberg will deal 20 damage before any additional buffs, letting him carve through some normally bulky units. The reason you'd want a Res forged weapon with a +Spd IV instead of a Spd forged weapon with a +Res IV is because the latter will get you 1 less Spd overall. +Spd with a Spd forge is also a viable option, but other dagger users like Sothe and Legault are more suited to all-out offense, so you're going to want to lean into Kaze's fantastic Res. Additionally, -Def is preferred to -HP because Kaze will still use his HP to take magical hits, and his Def is so low it's not worth preserving.
Mirror Strike 2 is chosen both to help in taking out mages, and compensating for his rather middling Atk against more defensive units. Since Kaze will have 39 Spd with a +Spd IV, you'll get more mileage out of bumping up his Atk than going for Spd to secure doubles he might already be getting. His special comes down to preference: Desperation 3 can help him still deal with mages even when he lacks the HP to tank, and Swordbreaker 3 lets him take care of the abundance of very fast sword users, or at least, cripple them enough so anyone following him can take them out. His natural Atk Smoke 3 is an extremely good option, as it can further cripple nearby mages and give him a strong enemy phase, but it can be swapped out as needed. The seal comes down to preference: Spd Smoke 3 will help out his team with securing or avoiding doubles, as well as giving him a stronger enemy phase, but Def Ploy will make him much stronger on player phase, since very few units can exceed his Res, thus letting him bypass his Atk easily and securing kills he wouldn't otherwise be able to go for.