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Yoob is a giant, Shroobified Yoshi that appears Mario & Luigi: Partners in Time. He starts out as a large pink and green Yoshi Egg, where it becomes a tourist attraction that tourists can see for five Coins. When Yoob is released from the egg, he eats the Yoshis.
Yoob is first seen after discovering a group of Yoshis still hiding on Yoshi's Island. He quickly eats all of them, including Yoshi and Kylie Koopa, although Kylie is quickly spat out. Yoob then leaves the area. Later, Yoob is climbing a cliff when two Shroob UFOs appear and enlarge him. Yoob then proceeds to eat Baby Bowser, Mario, Luigi, Baby Mario, and Baby Luigi.
Once inside Yoob's Belly, the group (sans Baby Bowser) helps some of the previously swallowed Yoshis move forward in Yoob's stomach by pushing a Chomp Rock, which literally clears a path that lets them walk through Yoob's intestines. They then discover that part of Yoob's belly is a factory for trapping Yoshis. The factory, maintained by RC Shroobers, stores Yoshis in Yoob Eggs, then places them on a conveyor belt that takes them to Sunnycide. The group helps the Yoshis push the Chomp Rock away, then find Toadbert, who has forgotten his memory but is still taking care of some trapped Yoshis. Toadbert tells them that Sunnycide is guarding the exit, and they go to confront it at the end of Yoob's belly. Sunnycide uses the Yoob Eggs in battle, and likewise, the heroes can free the Yoshis by breaking the eggs. Eventually, they defeat Sunnycide, and everyone, including the Yoshis, Toadbert, and Baby Bowser, escapes Yoob through the digestive tract.
If Mario and Luigi return to Yoshi's Island, they can find Yoob's body still on the cliffside. They are able to re-enter Yoob as they wish, though they must exit through the digestive tract again.
In the Super Mario-Kun, Yoob appears in volume 36. Unlike in Mario & Luigi: Partners in Time, Yoob originally was just a giant, carefree, friendly Yoshi who is gluttonous. He is used as a vessel for Sunnycide, as Sunnycide takes control of the giant Yoshi and turns him into a Yoob. After the brothers get eaten, they defeat Sunnycide inside, which reverts the Yoob to his normal state. The giant Yoshi then eats the Cobalt Star Shards, which causes the brothers to panic, and ends the chapter. They manage to get the shards out of him.
Yoob resembles a pink Yoshi, except it is much larger and fatter (even bigger when the Shroobs zap it), has black spines, a black saddle, blue shoes, green underbelly, black irises, red pupils, and pincers. Yoob bears a loose resemblance to Barney the Dinosaur, the host of Barney & Friends, an educational children's program. As a matter of fact, a Nintendo Power issue predating the release of Mario and Luigi: Partners in Time mentioned the similarities in a pre-release screenshot of the game.
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