I'd actually love for
![Pichu Melee :pichumelee: :pichumelee:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
to return and be vastly improved. Pichu is one of my favorite Pokémon.
If this isn't just special treatment for Mewtwo, I think at least
![Wolf :wolf: :wolf:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
is a given.
![Ice Climbers :popo: :popo:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
could come back if Sakurai finds a way to implement them into the 3DS version.
![Pokémon Trainer :pt: :pt:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
sadly seems unlikely (though I'd love a moveset based around the game's items). I doubt
![Squirtle :squirtle: :squirtle:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
and
![Ivysaur :ivysaur: :ivysaur:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
, but if they make many DLC characters, I wouldn't say they're impossible.
![Snake :snake: :snake:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
sadly had rights issues, so he's likely gone even now.
![Lucas :lucas: :lucas:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
and
![Roy Melee :roymelee: :roymelee:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
have their own western fanbases despite not seeing their games in the west, so I wouldn't doubt them, though they're Japan-only status could hold them back, especially with so many Fire Emblem characters already in
![Roy Melee :roymelee: :roymelee:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
's case. I doubt we'll see
![Pichu Melee :pichumelee: :pichumelee:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
(being a joke character) and
![Young Link Melee :younglinkmelee: :younglinkmelee:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
(because
![Toon Link :4tlink: :4tlink:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
), but I wouldn't say it's impossible.