Impa Side Special:
Flashbang:
This is a slower version of the Burst Grenade that Impa uses to her advantage. The difference in effect is also apparent, as she deals 9.5% damage as opposed to Sheik's 14.6%, but in turn, anyone facing the explosive will be immediately stunned, as though they were hit with Mewtwo's Disable. Being directly in the blast radius, meanwhile, will stun regardless of orientation. However, the stun doesn't affect airborne opponents, and being inside the blast will simply launch them. You would think she was using a Deku Nut on a trigger with this, and she just might be.
Impa Down Special:
Swooping Falcon:
Impa's own leaping kick functions the same as Sheik's Bouncing Fish, but as the name implies, there's a different thing going for her. At the apex of the move's jump arc, Impa gains a wicked burst of speed that can catch opponents off guard. This does, however, sacrifice Sheik's ability to trigger early, so Swooping Falcon is a committal special.
These two Specials would give her a uniqueness from Sheik that gives Impa a playstyle that requires tighter timing but yields a satisfying payoff. Although there is no rule that says an imitation cannot defeat the original, it could be argued that Impa is much more skilled than Sheik at Sheikah arts. I believe these two to play into that philosophy splendidly.
