Trying interesting builds?

Merge project for 4 stars units
Fury + desperation builds
TA + Raven tomes
Death blow + sword breaker for Lilina
Defensive-supportive Saizo
Blue blade Reinhardt
Brave axe cherche
Slaying axe for slow and defensive greens

Est and Cherche both run Brave Lance/Axe and Death Blow very well and can get flier buffs for even more damage.
Corrin running a Dark Breath debuff set with smoke or threaten skills to complement her breath.
Hana/Selena/Laslow can all be great anti-armour with Death Blow/TA and a breaker.
Frederick/Gunter/Barst can be good Hammer or Brave Axes wielders.
Any mage can run Raventome, TA and Bowbreaker if they've nothing better to deal with Lyn in AA.

I run Cherche, Esrt and Corrin as above and they all preform very well.

EDIT: Desperation + Brash Assault is a fun addition to a brave weapon is they can reliably get down to 50% health. Run with a 3 turn special for carnage.

I'm all about unorthodox builds! Need a Flying Tank?

All major Skill inheritance can be found on Free units, or easily acquired ones (just need a boat load of feathers).

I've personally swapped Seal Atk for Seal Attack/Def from a 5* Seth, but it's not a crucial change, she performs most excellently either way.

Biggest thing is catering to the individual units strengths, try and build a Catria like a Cordelia or Tana, and of course she'll under-perform by comparison. Even this site suggests a Firesweep build for her, bollocks to that as you're completely ignoring her strengths.

I love building unusual units. I've gone through my collection of 5*s and picked out a few that I think deserve recognition for coming totally out of left field.

Lots of lances and bows...

Here's 21. I've marked them with magenta hearts.