Nintendo has no shortage of characters to choose from for its upcoming Smash Bros game for Wii U and 3DS. At E3, the company focused on the new characters being added to the fourth Smash Bros game: the hilarious Wii Fit Trainer, Capcom mascot Mega Man, and the Villager from Animal Crossing.

However, there are a number of other returning characters from previous games. By perusing all the screnshots and videos released thus far, here's who we've discovered:

See: All the characters in action »

While Nintendo is wont to add arbitrary features to its games to showcase its unique hardware, that won't be the case with its upcoming Super Smash Bros game for Wii U. Why? Because it could potentially give a player an advantage over another.

"The idea with Smash Bros., you have four players come together, and it's a fair playing field," director Masahiro Sakurai explained. "The idea of having one person with this special controller and special features that are only available to the gamepad player flies in the face of that. Right now, we're not adding any additional [GamePad] functionality at all."

Read more: Making a game for people 'on equal footing' »

At the end of their press-only gathering, Nintendo decided to hold a "one more thing" surprise. Promising more info on a long-awaited series, the audience held their breath as a screen from Wii Fit was shown.

Nintendo was trolling us, apparently. The camera zooms out, showing Mario and Link trying to follow along with the female trainer's instructions. And then: the surprise. Wii Fit Trainer will be the next character to join the Smash Bros roster.

Read more: 'Her moves are very fitness-based' »

The new Smash Bros for Wii U and 3DS will launch in 2014, Nintendo announced today during its E3 presentation. And a new character has been introduced to the roster: Mega Man will be joining the fight.

The game was announced back in 2011, and is being developed by Namco Bandai. Smash Bros director Masahiro Sakurai said that the team didn't want to lose focus by adding non-Nintendo characters "willy nilly" to the game, so they must have given some thought to adding Capcom's Mega Man.

Watch: Super Smash Bros. in action

While Sony has been aggressively pursuing third-party support for its upcoming PlayStation All-Stars: Battle Royale, Nintendo may be considering to go the opposite route for the next Smash Bros. The addition of Snake and Sonic to the roster in Brawl was heralded by fans, but Smash Bros director Masahiro Sakurai notes that he doesn't want to focus on adding too many non-Nintendo characters.

"I think Snake and Sonic joining were fantastic. It made many fans happy, and it broadened the Smash Bros arena," he said. "However, introducing more non-Nintendo characters willy-nilly will lose the focus of the game, so I also recognize the need to narrow it down."

Read more: But what about Namco Bandai? »

It's odd to remember that the original Super Smash Bros on Nintendo 64 debuted with only 12 playable characters. Since then, the franchise has expanded quite a bit, from 25 on Gamecube to 36 on Wii. Given sequels are supposed to be bigger and more badass than their predecessors, logic suggests that the next Smash Bros game for Wii U and 3DS should have even more characters, right?

Unfortunately, game director Masahiro Sakurai may have dashed hopes for a Smash Bros game with a giant roster. "In terms of quantity, we've probably already reached the limit of what's feasible," he said. "I think a change of direction may be what's needed."

Read more: Difficult to 'have them all feel distinctive' »

Update: Now with comments from Masahiro Sakurai and Namco Bandai's Masaya Kobayashi.

Nintendo did not internally develop Super Smash Bros. Brawl for Wii. Instead, it was a collaboration between a number of third party studios, including Game Arts, Monolith Soft, and Paon. Project Sora's Masahiro Sakurai, who directed the original N64 game when he was at HAL Laboratories, remained director of this hodgepodge development team.

Well, it appears Nintendo is outsourcing development once again for the next Smash Bros game.

Read more: Sakurai joined by Tales director »

Now that Kid Icarus: Uprising is finished, Masahiro Sakurai can get to work on the next highly-anticipated franchise title: Super Smash Bros. This fourth installment in the franchise is slated for the Wii U and 3DS, and Sakurai has shared some vague comments on his plans for the game. One thing is clear: the dual platforms will play a major role in its direction.

Read more: Simply expanding the series is a 'dead end' »

The next Super Smash Bros. fight game will be released on both Nintendo 3DS and the newly-announced Wii successor the Wii U, Nintendo president Satoru Iwata explained during the company's E3 press briefing. Series designer Masahiro Sakurai is once again onboard

"A few months ago I explained the concept of Wii to Mister Sakurai, who was developing [Kid Icarus: Uprising]," Iwata said. "We were discussing which platforms his next game should be developed for--Nintendo 3DS or Wee U? What Mister Sakurai suggested then was an idea to make Smash Bros. for both Nintendo 3DS and Wee U, to make it work together on both platforms. Read more »