1. Yoshi egg
All right, this one’s cheating a little, because where all the other eggs on this list are singular, the term “Yoshi egg” actually encompasses a wide variety of eggs spread out across numerous games. But their ubiquity and versatility makes them hard to ignore, and considering that Yoshi’s a purportedly male character, he’s left an awful lot of these things laying around over the years.
Yoshi eggs started out fairly simple; in 1991’s Super Mario World, they were a power-up, albeit a really cool one; find an egg, and it’d hatch into a dinosaur that you could ride. Later in the game, different-colored ones started appearing, giving you little hatchling Yoshis that you’d have to carry in front of you like a bulldozer blade, running into enemies so that your new pet could swallow enough to become a full-sized Yoshi.
It was in Super Mario World 2: Yoshi’s Island that these things really came into their own, though. As Yoshi ate enemies, he’d immediately metabolize them into eggs, which followed him around in a line and could then be used as ammunition. Not only was this an awesome (and possibly scatological) use for enemies, but it made the eggs much more central to the gameplay than when they’d just held a new friend for Mario to ride.
This also set the standard for the way they’d appear in future games, particularly the Smash Bros. series, in which Yoshi can gulp down opponents and encase them in eggs. This of course raises some interesting questions as to just what the hell is going on inside that dinosaur’s body, and what purpose eggs really serve for the species, considering Yoshi also uses them as safe hiding places in games like Super Mario Galaxy 2.
Probably better not to dwell on it, then, and just concentrate on how awesome those eggs are. And not what Mario or Samus go through when they’re rocketed through Yoshi’s digestive tract and wind up encased in an egg.