Character description
Yoshi first appeared on Mario's first Super Nintendo Entertainment System game, Super Mario World. In the game, the player played as Mario or Luigi, and were able to find Yoshi eggs, which would hatch automatically, revealing a full-grown Yoshi. Later in the game, baby Yoshis could also be found. The player could grab these baby Yoshis and toss them around like they could with a shell. They could also feed the Yoshi 5 enemies, which would result in the Yoshi maturing, allowing the character to ride the Yoshi's back. Also in the game, 4 different color Yoshis were introduced, each with its own special abilities, depending on what color shell it had in its mouth. The green standard Yoshi was the most common found color Yoshi. He grew wings and could fly freely when he had a blue shell in his mouth. When he had a red shell in his mouth, he could spit fire. Lastly, when he had a yellow shell, he could stomp the ground when he jumped. The color of the Yoshi indicated what his special abilities were when they had a shell in their mouths, matching the colored shells. No matter what shell they had, the blue Yoshi could fly, the red Yoshi could spit fire, and the yellow Yoshi could always stomp the ground.
Yoshi then took the spotlight in Super Mario World 2: Yoshi's Island for the SNES. As the main playable character, Yoshi kept all his previous moves (eating things, pounding the ground) and added a few new ones (using his tongue, egg tossing, flutter jumping). The game was a prequel of sorts to the Mario universe: Baby Luigi was captured by Kamek while being delivered by the stork, while a group of Yoshis discover the missing Baby Mario and work to rejoin him with his brother.
Yoshi went on to become a mainstay in the Mario series, as well as his own spin-off series. In the Mario sports games, he is portrayed as the speedy type - he may not have that much power, but he can get from A to B faster than most others.
 In Super Smash Bros.
Yoshi makes his first appearance in a fighting game in the original Super Smash Bros. as a starting playable character. As the twelve-character roster goes, Yoshi is arguably the most unique. Not only does his shield not follow the same laws as other shields, but he lacks a triple jump - which he makes up for with a massive and generally safe double jump. These unique points make Yoshi a bit difficult for beginners to learn. He is ranked 6th on the current tier list, in the very middle.
Yoshi's in-game description reads:
Yoshi returns in Melee as a starting playable character. Yoshi stays relatively unchanged, but is given a few new visual properties, such as a more realistic dinosaur posture and several new, unique techniques such as edge-canceled eggs. Although Yoshi can continue to double jump cancel, he continues to lack a third jump and is still unable to jump out of his shield, two things that are hard to simply brush off. That said, his unique shield physics, agile yet heavy frame, and somewhat powerful attacks are not to be shunned. Yoshi was somewhat nerfed in Melee and is ranked 18th on the current Melee tier list.
Yoshis are gentle, fleet-of-foot dinosaurs that make their home on idyllic Yoshi's Island. They come in a variety of colors and have evolved an interesting trait to help increase their numbers: they can transform anything they swallow into an egg. With adhesive tongues and bottomless bellies, Yoshis have been known to eat anything.
Yoshi once again returns as a playable character in Brawl. He appears in his more recent cartoony stand-up look from the Mario Sports and Party games. His moves are relatively unchanged from his Melee moveset, except for the fact that his up special move, the Egg Toss, now acts somewhat as a third jump, which gives him a little extra air/stall time. This is a welcome addition for Yoshi, especially since the directional airdodge seen in Melee has been removed, which previously aided Yoshi in his recovery. He also keeps the unique ability to be able to resist knockback during his second jump. Yoshi is ranked 27th on the current tier list in D tier.
A creature that hails from Yoshi's Island. Yoshi's come in a variety of colors, and all possess gentle personalities. No matter what problems they face, they always look like they're having fun. Yoshi's use their long tongues to grab and swallow fruit and enemies. They can convert what they swallow into eggs, which they then lay. They also give Mario rides.