The Yoshi universe refers to the Smash Bros. series' collection of characters, stages, and properties that hail from the sub-franchise of the Mario series that deals with main sub-series character Yoshi. It is generally agreed on that Yoshi and related items count as Mario properties, but Yoshi has appeared in enough of his own games alongside enough original characters and properties that many consider him as holding sway over a "sub-universe" of Mario. Yoshi is also considered part of his own universe because his smasher's insignia consists of a spotted Yoshi Egg rather than the iconic image of a Super Mushroom held by other Mario characters.
 Franchise description
By 1990, Nintendo had established a hugely successful Mario video game franchise in a trio of NES platforming titles named Super Mario Bros., featuring Mario as a main character. Nintendo released the SNES in 1991, and Shigeru Miyamoto developed the platformer Super Mario World as a launch title. Graphics designer Shigefumi Hino, who would later direct Pikmin, created the dinosauric character Yoshi and had him and the rest of his multicolored species introduced into the Mario universe through Super Mario World because Nintendo's design staff expressed a desire to see Mario ride a dinosaur. Yoshi was instantly popular with players and soon afterwards became the protagonist of his own series of platform and puzzle games for various consoles, as well as appearing frequently in many Mario games as a co-character.
Yoshi was made the main character of his own sub-universe with the release of the 1995 SNES prequel Super Mario World 2: Yoshi's Island, which introduced characters like Baby Mario and enemies like Raphael Raven, and the further sequel Yoshi's Story for N64 introduced a more saccharine atmosphere to the sub-universe along with more original characters like Pak E. Derm. Other games in which Yoshi has had a starring role include the puzzle games Yoshi's Egg, Yoshi, and Tetris Attack, Yoshi's Touch & Go! for the DS, Yoshi's Island DS (a sequel to the original, with more playable characters and the same art design), and as a playable character in Super Smash Bros. and Super Smash Bros. Melee.
The Yoshi sub-franchise is essentially the division of the main Mario franchise that focuses on being especially bright and cheery, and in various cases Yoshi-centric games are oriented more towards young gamers than the general Mario games. Yoshi itself is a frequently recurring character in many of the Mario games, however, and is practically a staple character in games where many Mario characters are available for selection, such as all of the Mario Kart series, the Mario Sports series such as Golf and Tennis, and the Mario Party series. For his repeated involvement in this multitude of Mario titles, Yoshi has become a major character in the Mario universe.
 In Super Smash Bros
If treated separately from the Mario universe, the Yoshi universe is only about as big as most of the other franchises represented in SSB, with one character and one stage represented, and there is no item that can be considered Yoshi-centric.
The character, Yoshi, is considered both part of his own universe and part of the "Marioverse."
- Yoshi: A multicolored species of bright, optimistic dinosaur first seen as a mount for Mario in Super Mario World, one particular green Yoshi, who the name Yoshi is often used to refer to, is often a costar in many Mario games, and it has also been made as the star of many of its own games, often platformers and puzzle games. Yoshi are used as a mode of transportation by Mario at times, and in other cases Yoshi take it upon themselves to transport baby versions of Mario characters in games like Yoshi's Island DS. All colored species of Yoshi have the ability to swallow up enemies with their strechable tongues and eject them as Yoshi eggs, which the Yoshi can find various uses for such as throwing the eggs as projectiles. Yoshi are also able to hover in air momentarily. These abilities are directly reflected in Yoshi's appearance as a Smash Bros. fighter; however, it is one of two fighters not to have a third jump in its B-Up move, which is considered a major disadvantage.
If the Yoshi universe is counted as separate from the rest of the Mario universe, Super Smash Bros. features one Yoshi-themed stage:
- Yoshi's Island: This stage is designed to resemble Yoshi's Story (not '"Yoshi's Island" from the SNES platformer titles) for the N64 thematically, with the main stage itself consisting of a giant storybook with several clouds appearing and disappearing at the sides of the stage.
- 9: A remix of music heard in Yoshi's Story for N64, heard on Yoshi's Island. Both the music and the stage were reused in Melee.
- 19: The victory fanfare of Yoshi is a lighthearted orchestration heard in Yoshi's Story.
 In Super Smash Bros. Melee
While Melee is much bigger than Smash, none of the game's items are based on Yoshi save for the Yoshi's Egg item which was only used in an Event Match, There is only one character, two new stages along with Yoshi's Island returning from the previous game, and a bunch of new Trophies.
- Yoshi is still the only character from the Yoshi universe that is actually featured as a playable character, reprising his role as a fighter with a high double jump but no third jump. He is able to turn himself into an egg and bowl through opponents on the ground as his new B-Forward Move.
 Common Enemy
- Fly Guys: These appear as obstacles on the Yoshi's Story stage, carrying food. While their main-species, Shy Guy, debuted in Super Mario Bros. 2 from the Mario universe, the Fly Guy variant debuted in Super Mario World 2: Yoshi's Island, making a cross-over between the two universes.
- Yoshi's Island: Yoshi's Island: This stage is a general depiction of Super Mario World`s tileset, with blocks that swivel when they are attacked and characters can fall through them while swiveling.
- Yoshi's Island: Yoshi's Story: A somewhat simplistic stage based on Yoshi's Story, featuring Fly Guys carrying food flying through the stage and Pak E. Derm being in the background.
- Past Stages: Yoshi's Island 64: The original Yoshi's Island stage returns in Melee totally unaltered.
- 9: Yoshi's Story: A track straight from the N64 game Yoshi's Story, appearing on Yoshi's Island: Yoshi's Story.
- 10: Yoshi's Island: A repeating banjo track heard in several levels in Super Mario World for SNES. It appears on Yoshi's Island.
- 28: Yoshi's Island N64: The music for SSB64's Yoshi's Island stage, which comes from Yoshi's Story for N64, is brought back unaltered along with the stage itself as Past Stages: Yoshi's Island.
- 42: Yoshi's Victory: The victory fanfare of Yoshi is a lighthearted orchestration heard in Yoshi's Story.
 Full Trophy List
 In Super Smash Bros. Brawl
The Yoshi universe receives representation in Super Smash Bros. Brawl.
- Yoshi: Yoshi was the last of the "Original 8" to be revealed as a returning character in Brawl. He has been visually modified to more accurately resemble his more recent appearances in Yoshi's Story and other newer Mario games. In addition to some old moves being modified (his Up B, Egg Toss, now also functions as a third jump), Yoshi also enters the fray with a brand new attack: his Final Smash is Super Dragon, which is based off of the powers that Yoshi could obtain in Super Mario World by holding certain colors of Koopa shells in his mouth for extended periods of time. When the Final Smash is executed, Yoshi suddenly sprouts wings and can fly around for a short period of time, during which he can spew flames from his mouth with the press of a button.
On the final character select screen (after all characters are unlocked), Yoshi, despite being part of the Original 8, doesn't appear in the top row in the spot between Samus and Kirby (probably because Yoshi is the only character representing his franchise). Instead, he shares a column with fellow Mario side series characters Donkey Kong, Diddy Kong, and Wario.
 Common Ally
- Support Ghost: Support Ghosts appear on the Yoshi's Island stage periodically, acting as a platform for other characters.
 Common Enemies
- Sky Guys: Sky Guys from Super Mario World 2: Yoshi's Island fly into the stage carrying food, repeating the Fly Guy's function in Melee, although now they only appear in groups of one, two, or three.
- Yoshi's Island: The first Yoshi stage to be based off Yoshi's Island instead of Yoshi's Story, this stage has the appearance of being drawn with crayons and pastels. The stage changes seasons during gameplay.
- Melee Stages: Yoshi's Island: One of the few stages known to return from the previous game, it has only got some minor differences such as a few areas that differs and the addition of My Music. Otherwise, it's unaltered.
- Obstacle Course - A medley consisting mostly of a remix of the "Athletic" level theme from Super Mario World 2: Yoshi's Island and also a bit of the final boss theme. It is used on the Yoshi's Island stage.
- Ending (Yoshi's Story) - A tropical sounding remix of the credits theme from Yoshi's Story. It is used on the Yoshi's Island stage. This song is also played during Yoshi's Classic Mode credits.
- Yoshi's Island - A jazzy remix of the commonly heard ground level theme from Super Mario World 2: Yoshi's Island, complete with a harmonica (which was used in the original version of the song). It is the theme of the Yoshi's Island stage.
- Flower Field - Taken directly from the DS title Yoshi Touch & Go, this was the theme to the level of the same name. It is used on the Yoshi's Island stage.
- Wildlands - A combination of the "level beginning" jingle and the Wildlands level theme from Yoshi's Island DS. It is used on the Yoshi's Island stage.
- Yoshi's Island (Melee) - Taken directly from Melee. It is used on the Yoshi's Island (Melee) stage.
- Yoshi's victory theme - A whimsical orchestration of the Yoshi's Story main theme and level complete fanfare.
- Yoshi (Mario Party 2)
- Yoshi Ship (Yoshi's Universal Gravitation/Yoshi Topsy-Turvy)
- Mace Guy (Yoshi's Universal Gravitation/Yoshi Topsy-Turvy)
- Shy Guy (Yoshi's Story)
- Pak E. Derm (Yoshi's Story)
- Bone Dragon (Yoshi's Story)
- Don Bongo (Yoshi's Story)
- Propeller Shy Guy (Yoshi's Story)
- Blargg (Yoshi's Story)
- Tap-Tap (Yoshi Touch & Go)
- Yoshi's Egg (Yoshi Touch & Go)
- Yoshi (Yoshi Touch & Go)
- Brier (Yoshi Touch & Go)
- Super Baby (Yoshi's Island DS)
- Crazee Dayzee (Yoshi's Island DS)
- Goonie (Yoshi's Island DS)
- Stork Stop (Yoshi's Island DS)
- Stork (Yoshi's Island DS)
- Kamek (Yoshi Touch & Go)
- Car Yoshi (Yoshi's Island series)
- Kamek (Yoshi's Island series)
- Burt the Bashful (Yoshi's Island series)
- Bubble Baby Mario (Yoshi's Island series)
- Baby Mario (Yoshi's Island series)
- Raphael the Raven (Yoshi's Island series)
- Eight Yoshis (SMA 3: Yoshi's Island)
 Games with elements in Smash Bros. games
 Super Mario World
Technically, this game falls under the Mario universe category, but there are several elements from the game that goes with movesets and stages.
In Super Smash Bros. Melee, there is a stage called Yoshi's Island that is based off of that game. A few of Yoshi's moves in all three Smash games are also based off of what he could do in that game. In Super Smash Bros. Brawl, Yoshi's Final Smash, Super Dragon, is based off the fact that when Yoshi eats certain kinds of Koopas, he gains some kind of ability, such as being able to breathe fire with a red Koopa.
 Super Mario World 2: Yoshi's Island
In Super Smash Bros. Brawl, there is a stage called Yoshi's Island that is based on many elements from that game, such as the design of the stage (which looks similar to drawings) and the background characters. There are also some pieces of music that come from the same game. They all play on this stage.
Some of Yoshi's Special moves come from this game.
 Yoshi's Story
In Super Smash Bros., there is a stage called Yoshi's Island that was based on this game, featuring the Super Happy Tree and other characters from Yoshi's Story in the background, and a main platform resembling an opened book. This stage returned as a past stage in Super Smash Bros. Melee.
In Super Smash Bros. Melee, there is another stage based on Yoshi's Story, which is also named after it.
 Other Games
Other games such as Yoshi Touch & Go and Yoshi Topsy-Turvy have their songs and stickers in Super Smash Bros. Brawl.
|Host||Super Smash Bros.|
|Character-based||Donkey Kong · EarthBound · Fire Emblem · F-Zero · Game & Watch · Ice Climber · Kid Icarus · Kirby · Mario · Metal Gear · Metroid · Pikmin · Pokémon · R.O.B. · Sonic the Hedgehog · Star Fox · The Legend of Zelda · Wario · Yoshi|
|Stage-based||Animal Crossing · Electroplankton · Nintendo DS|
|Assist Trophy-based||Advance Wars · Custom Robo · Daigasso! Band Brothers · Devil World · Drill Dozer · Excitebike · Golden Sun · Kururin · Nintendogs · Punch-Out!! · SimCity · Sin and Punishment · Starfy|
|Characters||Yoshi (SSB · SSBM · SSBB)|
|Stages||SSB: Yoshi's Island|
SSBM: Yoshi's Island · Yoshi's Story · Past Stages: Yoshi's Island 64
SSBB: Yoshi's Island · Melee Stages: Yoshi's Island
|Stage locations||Yoshi's Island|
|Trophies & Stickers||Trophies in Melee · Trophies in Brawl · Stickers in Brawl|
|Music||Music in Brawl|
|Related universes||Donkey Kong · Mario · Wario|