L!Marth Opinion

If you're buffing his def I would try to avoid fury. The recoil will add up within 3 battles when he only has 40HP.

Pretty good build. You could also try stacking double Atk/Spd Bond once TT arrives.

I have been running this build with a Titania handcuff. I allow my other two units (usually armors) to run independently and get their buffs from Fire Emblem. Works absolute wonders. Sometimes I run Brazen Atk/Res 3 Seal on L!Marth. Titania sometimes runs a Ploy in C, Rally Atk+, and Def Tactic.

With his high speed and having the HP requirements met by using Fury, I'd go with Desperation for B-Skill instead of Binding Shield, unless you're targeting dragons specifically. (which is still not really a good idea, since he already has Falchion)