I listed some vanilla preexisting skills from last time Vesly asked for buff skills, so here we go again.
Bold Fighter: If unit initates combat, unit doubles.
Vengeful Fighter (A weaker Quick Riposte): If defending and HP is 50% or higher, unit doubles.
Brash Assault: If unit initiates combat against a foe that can counter and units HP is 50% or lower, unit doubles. (This is similar to AdVantaged and Shuusuke’s “Confident Strike”)
Odd Follow Up: If it is an odd-numbered turn, unit doubles and foe cannot double.
Even Follow Up: If it is an even-numbered turn, unit doubles and foe cannot double.
Dive Bomb: If both combatants are at least at 80% HP, unit can double before foe counterattacks (like Desperation - this isn’t a free double)
Deflect Melee: Reduces damage from melee follow up attacks, including brave weapons, by 80%.
Deflect Missile: Reduces damage from ranged follow up attacks, including brave weapons, by 80%.
Deflect Magic: Reduces damage from magic follow up attacks, including brave weapons, by 80%.
Binding Shield: Against dragons, unit always doubles. If initiating, dragons cannot counterattack. If defending, dragons can’t double.