Mr. Saturn (Dosei-san in Japan) are a species in both EarthBound and Mother 3. Shigesato Itoi (creator of the Mother franchise) stated in an interview that Mr. Saturn are supposed to represent innocence. Almost all Mr. Saturn have the same odd mannerisms and personality quirks. They speak a strange, possibly alien language composed of oddly shaped English letters (excessive swirls, larger letters, and erratic capitalization). They also sporadically use words such as "boing," "zoom," and "ding." Shigesato Itoi stated that he based the font off of his own daughter's handwriting. Rarely are Mr. Saturn categorized by specific monikers, except for the Dr. Saturn in EarthBound. Also, Mr. Saturn never specify their gender, except for one Mr. Saturn who says, "Girl, Am girl," in Mother 3. All Mr. Saturn look about the same; they have whiskers, a large nose, and a ribbon. The Mr. Saturn can also be intelligent at times, aiding in the creation of the Phase Distorter and the Absolutely Safe Capsule.
Mr. Saturn generally have strange, alien-like furniture in their homes (things resembling UFOs, Mr. Saturn-like ATMs, tables with legs, bouncing furniture, and random ladders). One Mr. Saturn is even found living in a trash can. Culinary delights of Mr. Saturn are also out of the ordinary. Their favorite foods include things such as peanut cheese bars and piggy jelly (both of which can be bought in the stores of Saturn Valley). Ladders such as the ones in houses are also scattered throughout the Mr. Saturn home of Saturn Valley. Saturn Valley is a rather remote location, although the Pigmask Army manages to find it in Mother 3 (as well as the party in both games). Saturn Valley is the homeland of the species, in both Mother 3 and EarthBound. Oddly enough, it is located both in Eagleland (the land of EarthBound) and the Nowhere Islands (the land of Mother 3). In both games, the party ends up rescuing the Mr. Saturn in some way ( Lucas, Kumatora, and Boney rescue the Mr. Saturn--and Duster--from the Pigmask Army, while Ness, Paula Polestar, and Jeff Andonuts rescue the Mr. Saturns from oppression from Master Belch.) Mr. Saturn are also an item in Super Smash Bros. Melee and Super Smash Bros. Brawl (a sticker as well). They are often regarded as one of the worst items in the series, as they only add a couple points of damage to the percentage, and they merely bounce off. The Mr. Saturn item is useful for one thing, however; breaking shields. Its status as a humorous item is strengthened by its description in Super Smash Bros. Brawl, which is, "Pwaaaaah. Pwaaaaah." Mr. Saturn is a trophy in both games, as well as two stickers in Super Smash Bros. Brawl; one being the clay model from EarthBound. When applied to a trophy base, the character always spawns with a Mr. Saturn in hand. The smaller, Mother 3 sprite sticker can only be applied to Ness and Lucas, and it upgrades the PK attack power. Mr. Saturn appears in one more place in the Super Smash Bros. franchise; one of Ness' alternate costumes has a black t-shirt with a Mr. Saturn on it.