Lucario can be Bonnie.
(Because of the color and shape.)
Pikachu or Falco can be Chica.
(I like PikaChica more.)
Fox is obviously going to be Foxy.
R.O.B. can obviously be Endo.
Waluigi, while not here, can be Purple Guy.
(He has had enough of our shit.)
Sakurai can be Scott.
(Both the main creators of their own franchises.)
Piranha Plant can be Puppet.
(Pirahna Puppet is the only thing that looks close to popping out of a box.)
Ness can be Balloon Boy.
(Both are children that are just as annoying.)
Who else?