Show me your Setsuna!

Brave Bow
Reposition/Drawback
Luna
Swift Sparrow/Life and Death/Fury
Chill Spd/Chill Def/Desperation
Odd Atk Wave

This set is just basically a Colourless Ishtar. High Investment is also there to make her work properly.

+Spd -Def, +10
Brave Bow+
Drawback
Luna
Life and Death 3
Desperation 3
Atk Smoke 3
Seal: Flashing Blade 3

4* Lvl 1
Assassin's Bow
Reciprocal Aid
Special: nothing
A: nothing
B: nothing
C: nothing
SS: nothing

I don't want to. It's private.

+atk IV
Firesweep bow+,
Luna/moonbow
A - L&D, SwiftSparrow
B - Chill def/spd (or special spiral ;] )
C - savage blow (or any supportive skill)
SS - +atk/+spd, dual savage blow
If you investments in some megers you get nice hero.
Her damage is too low for good BB use when there is so much armored and dragons with DC.

She was +atk lvl 40 but now she is +spd lvl 1

If you insist I guess I'll show you.
I don't think it will help though it's just the standard Brave build and I agree her damage with it underperforms.

I also use Slaying Bow+ w/spd refine incase I need the extra 8 speed