Any units from two separate games that you would like to see interact?
As for one I would like to see:
Hexlance : 16mt Rng 1
Grants Atk +3. Calculates damage by the lower of foe’s Def or Res. If unit initiates combat inflicts Def/Res-3 on foe and neutralizes foe’s bonuses to Def/Res (from skills like Fortify, Rally, etc.) during combat.
Resonance Skill: Grants【Resonance: Blade】to unit and allies from the same titles as unit. At start of every third turn, if Harmonized Skill has already been used, unit can use Harmonized Skill again. 【Resonance: Blades】 Grants Atk/Spd+4 during combat for 1 turn.
(I can’t imagine what other kinds of Resonance Skills we’ll see in the future)