Lene Build

Seems counterproductive to use Blaze Dance + Firestorm Dance. You could give Lene WoM instead of Firestorm Dance and keep the seal. Or change the seal to Drive Atk

Is that a troll build?
Safeguard works only on the enemy phase while Darting blow works on the player phase, Blaze dance's buffs don't stack with firestorm dance, and even with that you will get better results if you have her with drive as seal and WoM as B slot since dance skills are not that good, you need you character to waste his movement before he ca get the buffs, and you can give it only to 1 character making them way inferior to Hones and Tactics which gives the buff without needing them to waste their action and they buff more than 1 ally.
Also even if she is able to double she won't kill even Greens with that atk stat, you will get better results if you give her TA and something more defensive, most melee greens has around 30 def or more and 45 HP, and Lene can't kill those character

I'm not a huge fan of any player phase ability on a dancer if I'm being honest. I think the A slot would be better used as a bond skill. EDIT Triangle Adept is budget, but then you'll lose a Roy merge.

Maybe swap the Seal with drive attack?