Jun was planned to be added into the arcade version of the game, but was later cut some time during development. Her data still exists within the game’s code and can be accessed using MAME cheat files. When added back in, she uses Nina’s character model and Jin’s moveset. Her voice and portrait does exist, but there are assets taken from Tekken 2.
In an interview, Hideki Kamiya said he discussed putting "Dante" from the Devil May Cry series in the game.
Within the game's files are voice clips for five unused Create-a-Soul classes. These clips can only be heard in-game via mods or hacking. The unused classes are Noble, Scared Fighter, Beastmaster (Ranger), Clown, and Great Warrior.
20 of the villagers throughout the series were planned to appear in the game, but were cut. These villagers eventually made it into the "Welcome amiibo" updated re-release of Animal Crossing: New Leaf.

By datamining a demo build of the game, an image of Donkey Kong Jr. can be found, suggesting that he may have been planned to appear in the game instead of Diddy Kong. Interestingly, Diddy Kong's internal filename in the final version is listed as "dk_jr," suggesting that Diddy's appearance may have been a later addition.
In a “Making of” video, game director Koshi Nakanishi stated that the Bakers were originally going to have a pet dog named Diane that would have appeared at the dinner scene, but she was cut early in development.

While battle damage is used for Little Mac in the Wii U version, data suggests that other characters were planned to have similar effects. This can be seen in unused textures for R.O.B. in the game's data which seem to show battle damage. This is a remnant to Super Smash Bros. Brawl in which characters were also planned to have battle damage, but were left out.
There's data within the game's files for two unused characters, Wovama and Q.Takagi. When hacked into the game, both characters use Cassandra's model and will randomly pick a weapon and moveset. While the model and movesets for both character's were never created, their names do appear on the verses screen. But when used in game, Wovama's name remains blank under her health meter, and Q.Takagi's name will change to Spawn. Because neither character have models, it is speculated that they were cut very early in the game's development.
In the files are yellow and blue Yoshi icons, suggesting there may have more palette swaps planned for the game. In the final version, only green, red, and black Yoshis can be used.
Unused models and code for Mr. Krabs can be found in the game's data, suggesting he may have been planned as a playable character in one of the mini-games, most likely the "Save Me Money" mini game.
All 12 playable characters have dialogue in the game that goes completely unused. The audio references an object that's referred to as an Omochao-themed gate. This gate would've been opened via the use of a nearby Omochao. However, no such "Omochao Gate" appears anywhere in the game, and Omochao himself does not physically appear in any level of the game either.
There is an unused race within the game's data called "Ghost". It has 50 health and is immune to suffocation damage. It's rumored that these were originally part of a scrapped event but they can be re-enabled by editing some of the game's files.
Files for Dragonite from the Pokémon series suggest it may have been planned to be summoned from the Poké Ball. While it does not appear as an assist character in the final game, it does appear as a background character in the Kalos Pokémon League stage. Two models for the character exist, with one more in line of those summoned by the player, featuring higher resolution textures.
There are unused voice files in the game for Part 6 Jotaro, who isn't present in the final game aside from an image in the game's credits.
Unlike other boss characters, Spoiler:Giga Bowser is classified as a fighter in the game's files, even having placeholder slots for alternate costumes.
These are likely leftovers from the previous game, Spoiler:where Giga Bowser appeared as a playable transformation.
These are likely leftovers from the previous game, Spoiler:where Giga Bowser appeared as a playable transformation.
Near the scouter entries for Android #18 in the ROM are unused scouter entries for Android #13, Android #14, Android #15 and Super Android #13 from the movie Dragon Ball Z: Super Android 13.

The art of Super Mario Odyssey reveals that Rosalina was going to appear in the game as a non-playable-character in casual attire with a guitar. The book also reveals several unused outfits for Mario, such as the green Sprixie Princess from Super Mario 3D world, a Toadette costume, a costume of a Luma from Super Mario Galaxy, and a costume of Mario in a Japanese school girl outfit.
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