SSB4: Gekkouga/Greninja Final Smash
Street Fighter: Decapre Super Combo
BlazBlue: Valkenhayn Astral Finish
UMvC3: Spider-Man Super
UMvC3: Strider Super
Smash should take more from it's fighting game roots.
Add in a tag mechanic, Add in mega crashing in the air. Air Dashing.
Give every character a launching move or a "bound" to guarantee that every character has a 0 to Death or 0 to 50% combo.
Give us a Stamina mode that goes beyond 150HP. That shit was cool and it was another way to play Smash. Give us more HP and we're Golden.
Make every Smash punishable by adding more frames and emphasize tilts and combo starters.
I bet there are a crap ton more parallels between series and other fighting games.