Gobblegut has a rounded snout with prominent cheeks, a pair of orange eyes that are usually kept half-lidded unless it is angered, a mouth with eight slightly rounded teeth, and a large, bulbous chin that has numerous scars on it. It has jagged, orange crystals that protrude from its head, along its body, and the tip of its tail. Its body is serpentine and is dotted with six large, red-pink bulges (referred to as "bellyache bulges" by Bowser Jr.) that are its weakpoints. The topside of its body is covered in swirly scales that come in pink, blue, and green, while its underside simply consists of tan skin.
After Bowser Jr. summons it, the giant dragon circles the planet and eventually swoops down and crunches down on the surface of the planet in an attempt to injure Mario. When it blows steam out of its nose (making a noise akin to a train whistle), it dives down and tunnels right through the middle of the planet, thus exposing its six bellyache bulges to attack. The six bulges surrounding Gobblegut's body can be destroyed if Mario uses a spinning attack on them when they get temporarily stuck in the planet's surface while tunneling, or by doing a somersault and spin attacking a bulge. Each bellyache bulge yields 10 Star Bits when destroyed. After three hits, Gobblegut becomes angrier and starts moving faster. After the last bellyache bulge is destroyed, Gobblegut slows down, burps, and completely explodes, releasing a Grand Star.
The dragon featured as the main part of the Dragon Driftway course in the Mario Kart 8 DLC pack The Legend of Zelda × Mario Kart 8 is based on Gobblegut. In Mario Kart 8 Deluxe, two dragon statues appear in the battle course Dragon Palace, and their design resembles that of Gobblegut (albeit with legs).
In the Super Mario Mash-up in Minecraft, the Ender Dragon is replaced by Gobblegut.
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