IntelliHeath
As in "Heathcliff"
Sakurai gives you have one character choice. Choose wisely..Wolf + retooled slightly moveset
I would chose Isaac easily because I just knew that Sakurai wouldn't even thought about Isaac being playable character when he could bring Ice Climbers and Wolf back easily, and Inkling is 100% safe bet for next Smash.
I didn't included any third party characters into this decision because it required other company to be involved.