The Slime (スライム, Slime) is a common enemy in the Dragon Quest series, also serving as the series mascot.
In the Dragon Quest games, Slimes are often the first monster that players come across. They are typically the weakest monster, and can be taken down with ease, as they lack any real offensive abilities. Owing to their simplistic nature, there are many variants of Slime, to the point that they even have their own monster family. Other variations include the She-Slime (which, despite its name, is not necessarily female), the enormous King Slime, and the elusive Metal Slime. In later games, such as Dragon Quest IX, there are special Slimes that—though often unassuming—can merge with or stack onto other Slimes, creating a new type of Slime, such as a King Slime or a Slime Stack. Friendly Slimes also sometimes appear in the series and often greet the Hero with the phrase “I'm not a bad Slime”.
As the series progressed, Slimes grew popular among fans, becoming an icon of the franchise and starring in spin-off titles such as Dragon Quest Heroes: Rocket Slime. They are also often used as the emblem to represent the series as a whole, such as in the Itadaki Street series. They even sometimes make playable appearances, including the aforementioned Fortune Street series. Certain games include Slimes as companions with their own personality and dialogue. In localized titles, they often use slime-related puns or phrases: for example, "gooman" instead of "human", "slime" instead of "time", "accrooze" instead of "accrue", and saying "slurp" or "goo" as a verbal tic.
According to Masahiro Sakurai, while his first choice for a Dragon Quest fighter was the Hero, he would not have opposed a Slime being playable on Square Enix's request. Ultimately, the two parties agreed on the Hero, but Slimes still feature prominently in the series' representation.
As a background character
Multiple Slimes appear on the Dragon Quest stage, Yggdrasil's Altar. This also includes a Liquid Metal Slime, which are rare like in their respective games.
As a moveset element
Slime appears in one of Hero's taunts, and three Slimes also appear in one of the Hero's victory poses. Solo, the Hero from Dragon Quest IV, has a Slime-themed earring on his left ear (which turns into a Metal Slime in his orange alternate costume).
As a costume
Slime appears as a paid DLC Mii Costume in the form of a hat. Uniquely, it wobbles and jiggles when in motion.
Various Slimes appear as spirits on the special DLC-exclusive Spirit Board. The standard Slime can be enhanced to King Slime at level 99.
The Hero's reveal trailer features Slime all throughout.