Super Mario series
Super Mario World
Yoshis debuted in Super Mario World, where they can be hatched from an egg if Mario or Luigi find them. In this game, Yoshis can eat enemies to defeat them, including enemies Mario and Luigi can't normally defeat on their own, such as Spinies. The green Yoshi can also use this ability to receive different powers depending on which color of Koopa shell he is holding in his mouth. These abilities are:
Yoshis can also eat Berries in this game, each of which have different effects. If a Yoshi eats ten red berries in the same level, he will lay an egg which hatches into a Super Mushroom. If it eats two pink berries in the same level, it will lay an egg that hatches into a coin-throwing cloud. This cloud will reward the player with a 1-Up Mushroom should they catch all the coins. Green berries will add 20 seconds to the timer.
In the SNES version of the game, Yellow, Red and Blue Yoshis can only be hatched from eggs in the Star World, and only the green Yoshi can be found in Dinosaur Land. However, in the Game Boy Advance remake of the game, the different colored Yoshis appear at random in Dinosaur Land after they are discovered in the Star World. If Mario or Luigi beats a level while riding a Yoshi, it follows him to the next level. However, Yoshis are forbidden from entering Ghost Houses and Castles, and will wait for Mario and Luigi outside until they've finished the level.
Super Mario Advance
Super Mario Sunshine
In Super Mario Sunshine, the Yoshi eggs start out as green but change to a different color once they eat a Fruit upon hatching. They also turn green if they are about to die from not eating another Fruit for a long time, or when they drown in water. While green, Yoshis spit water instead of juice.
Super Mario Advance 4: Super Mario Bros. 3
A Green Yoshi appeared in Super Mario Advance 4: Super Mario Bros. 3 (as well as the Super Mario All-Stars version of Super Mario Bros. 3). The Pipe Land's king was transformed into a Green Yoshi, who had done by stealing the king's magic wand.
Super Mario 64 DS
A Green Yoshi appeared in Super Mario 64 DS as one of the four playable characters. In VS Mode, player one plays as a Green Yoshi.
New Super Mario Bros. Wii
Green Yoshis appear in New Super Mario Bros. Wii. They are the first Yoshis to hatch out of Yoshi Eggs when playing the game solo. However, if the player reaches the Flagpole with Yoshi, Mario or the other character riding Yoshi will dismount Yoshi, who then waves goodbye. Therefore, only certain levels can have Yoshi. (These levels being 1-3, 2-5, 3-2, 4-5, 6-4, and 7-6.) They do not appear in either World 5 or World 8 though.
Super Mario Galaxy 2
New Super Mario Bros. U
The Green Yoshis are ridable in New Super Mario Bros. U. They behave like New Super Mario Bros. Wii, though unlike the previous game, Green Yoshis are the only colors available. Like in New Super Mario Bros. Wii and Super Mario Galaxy 2, Green Yoshi cannot be taken out of the levels they appear in.
Super Mario World 2: Yoshi's Island
In Super Mario World 2: Yoshi's Island and its remake, Yoshi's Island: Super Mario Advance 3, one is playable on every World's first level, and King Bowser's Castle in World 6, although in all other worlds, Blue Yoshi is playable on the final level. Green Yoshi is also playable in every Secret and Extra level in the game. This Yoshi seems to be the character Yoshi, though, nothing is confirmed.
In the remake, if the player manages to get 100 points in all levels, a cutscene will play which shows a Green Yoshi along with a message that says:
"What an amazing job!
The number (which is shown as X) that is shown in the message will depend on how well the player performs in the game.
Yoshi's Island DS
Green Yoshis also appear in Yoshi's Island DS. They help Baby Mario and the other babies to rescue Baby Luigi. Green Yoshis appear in the first level of each world and in the final level of World 5. In the final boss battle, a Green Yoshi carries Baby Mario.
Yoshi's New Island
Green Yoshis appear again in Yoshi's New Island. Like in Super Mario World 2: Yoshi's Island and Yoshi's Island DS, they help Baby Mario rescue Baby Luigi. Green Yoshis appear in the first level of every world and in the final level of World 6. Green Yoshi is also playable in every special level. In 2P Minigame Mode, player one plays as a Green Yoshi.
Mario & Luigi series
Mario & Luigi: Superstar Saga
Green Yoshis appeared in Mario & Luigi: Superstar Saga in the Yoshi Theater and the ending. Along with some other colored Yoshis, a Green Yoshi can be found hungry for a Bean Fruit. Green Yoshis also appear to be the mascot of the Yoshi Theater as a picture of it's head can be found in the banner.
Mario & Luigi: Dream Team
Green Yoshis appear in Mario & Luigi: Dream Team as NPCs.
Super Smash Bros. series
In the Super Smash Bros. games, Yoshi is a playable character. It has appeared since the first Super Smash Bros. installment, and in all the games in which it appears, alternate colors based on other colored Yoshis are available.
Mario & Sonic at the Olympic Games series
In the first installment of Mario & Sonic at the Olympic Games, Yoshi is a green Yoshi who appears as a playable speed-type character. He returns in the other two sequels in both the handheld and home console versions. He also returns in Mario & Sonic at the Sochi 2014 Olympic Winter Games. Green Yoshis can be also seen in the background of some stages.
Mario Super Sluggers
In Mario Super Sluggers, Yoshi appears as one of the team captains, as a balanced member. In the game's story mode, Yoshi may be unlocked after completing a few quests on Yoshi Park. Other colored Yoshis are part of its team and appear in the game as well.
Mario Power Tennis
In Mario Power Tennis, Yoshi is playable. Although green is the default color, there is an option to switch colors. Once the player wins the Flower Cup in doubles mode with any character, Yoshi will randomly change his color whenever he performs a Rolling Egg Return.
Mario Tennis Open
Much like in Mario Power Tennis, green Yoshis are default playable characters, although other colored Yoshis can be unlocked via QR code. In this game, there are green, pink, blue, yellow, red, black, white/silver and cyan Yoshis.
Mario Sports Mix
In Mario Sports Mix, Green Yoshi is the default skin color for Yoshi, although alternative costumes can be unlocked. There are green, cyan, pink and yellow Yoshis being playable, while a Red and a Dark-blue Yoshi serves as captains in Dodgeball. Other Yoshis can be seen in the background of some stages.
Paper Mario: The Thousand-Year Door
In Paper Mario: The Thousand-Year Door, Yoshi kids are partners, and the green one is the default. Also a non-playable green Yoshi appears.
In Super Mario World, Green Yoshi has green skin, but orange gloves, brown shoes and a brown saddle. In Super Mario World: Super Mario Advance 2, Green Yoshi's gloves were removed to match its current appearance.
In Super Mario World 2: Yoshi's Island, Green Yoshi looks about the same as he does in Super Mario World, but with orange shoes and a red saddle. He also doesn't wear his orange gloves, and instead he has bare green arms. In the Game Boy Advance port, Green Yoshi wore red shoes.
From Yoshi's Story to Super Smash Bros. Melee, Green Yoshi has red shoes and a red saddle. From Super Mario Sunshine and on, Green Yoshi has orange shoes and a red saddle, with the exception of Super Mario 64 DS, where his shoes were brown again.
Notable Green Yoshis
List of games
Note that in some of these appearances, Green Yoshi might be indistinguishable from the character Yoshi.