Inkling for smash? 
I posted this before about possible specials:
Down special: Ink splat - Can cause opponents to slip if they run/walk over ink and it function as a teleporter causing the inkling to immediately pop out of the ink puddle when the user does down b again after laying it down.
Side special: Ink Shot - Kinda like the FLUDD, but can temporarily slow down opponents, depends on the opponents percent, can be mashed out of.
Up special: Inkling Rocket - Inkling morphs into a squid and shoots strait up.
Neutral Special: Ink Bomb - Inkling throws out a Ink Ball, like the sticky bomb it will detonate once timer runs out can be passed on to opponents when passed. On detonation, ink bomb will go off and victim will be encased in a wrapping that will leave them immobilized.
(Think Yoshi's Egg Lay) Victim can mash out of the move, though harder to do at higher percents.
Final Smash?
[collapse=Ink Nuke]
Upon activating the Final Smash a column of Ink will pour down and gradually expand in a dome. Think a cross between the Starfox Smart Bomb and Luigi's Negative Zone in Brawl. Those caught in the dome can be encased in an Ink wrapping as a finisher effect of the nuke.
[/collapse]
