Palette Swap (Super Smash Bros. for Nintendo 3DS and Wii U)

In Super Smash Bros. for Nintendo 3DS and Wii U, because of the addition of the 8-Player Smash, each character has total of 8 palette swaps for each character (except for Little Mac, who has 16). Despite the 3DS not supporting eight player matches, it still features the same alternate colors as the Wii U version.

This time, unlike the previous games, some of the palette swaps are actual costumes (like Wario in Brawl), and some can even change voices too, mostly of their gender, such as Robin and the Wii Fit Trainer. Other characters have colors that completely change them into new characters, such as Olimar and Bowser Jr., complete with Announcer clips. However, none of these costumes change any characteristic regarding gameplay; all moves, hitboxes and properties remain the same.

Also, unlike the last three games, Team Battles no longer restrict characters to use the respective color scheme of the team (red, blue, etc), rather being outlined with the team color instead; and in the 3DS version, even if outlines are disabled in the settings, they will still show in Team Battles. This means that the player has complete freedom to pick whichever color he/she wants when playing Team Battles.

Bowser Jr.
Bowser Jr.'s alternate designs replace him with each of the seven Koopalings.

Little Mac


Little Mac is the only character with 16 different costumes, like how Wario had twice as many costumes as other characters in Super Smash Bros. Brawl. The wireframe design is based on the original arcade Punch-Out!! and shares the same range of color options.

Lucina


Lucina's alternate costumes are based on the color schemes of female characters from Fire Emblem: Awakening.

Mii Fighter
Each default Mii fighter design, as shown on the fighter selection screen, is similar a one of the guest Miis.
 * Brawler: Similar to Guest C, but with a different hair color, hair design, and a lighter skin tone.
 * Swordfighter: Similar to Guest B, but with a different hair style.
 * Gunner: Similar to Guest: F, but has a different hair style, along with a different colored shirt.

Olimar


Four of Olimar's costumes replace him with Alph, the main character of Pikmin 3.

Ryu


All of Ryu's costumes are based on his alternate costumes from Super Street Fighter II and the Turbo HD Remix.

Shulk


All but one of Shulk's alternate costumes are based on the color shcemes of his traveling companions from Xenoblade Chronicles.

Villager


Villager's appearance varies greatly between costumes, with their eyes, hair, gender and clothing all changing. All of Villager's alternate costumes, with the exception of the yellow costume, are based on how the player may look at the start of a new game depending on how they answer questions asked by Kapp'n or Rover in Animal Crossing: Wild World and Animal Crossing: City Folk respectively. The shirts/dresses worn are named below.

Wario


Wario has four fewer costumes than in Super Smash Bros. Brawl, now only having four biker and four overalls costumes.

Video
https://www.youtube.com/watch?v=w5dH8GEMeTc

Trivia

 * Little Mac's Battle Entrance is to jog into the stage in his pink clothes and then takes them off. If he is in his pink clothes form, he jogs into the stage again, but doesn't take his clothes off.
 * Little Mac is the only character so far to have more than eight palette swaps (excluding Wario, who had twelve in Smash Bros. Brawl).
 * Bowser Jr. is the only character to not be able to change his color, since his palette swaps are the Koopalings.
 * Ike, King Dedede, Kirby, Link, Little Mac, Lucina, Mega Man, Ryu, Samus, Shulk, Toon Link, Villager, Yoshi and Zelda are the only characters to have all their alternate colors originate from their respective games.