Bad Breath is a Skylander only featured in the Skylanders Academy television series. Of an unknown element, he possesses a powerful putrid breath to incapacitate enemies.
Bad Breath is easily startled or bothered, making him gassy. Despite his unpopularity with the other students, he appears to not mind, but too much stress has caused him to be temporarily put out of duty at the start of Season 1. Unknown to the rest, he sometimes uses empty rooms to burp for as long as he pleases.
Bad Breath can use a particularly putrid breath when burping, with such a powerful smell that it can temporarily knock his targets out and stick to clothing forever.
In Skylanders Unite!, Bad Breath was one of the cadets who took their test at the Skylander Games and passed. When Kaos stole The Book of Skylanders on Graduation Day, Bad Breath used his signature breath attack in an attempt to stop him, but Glumshanks shielded his master from the Skylander's putrid breath. He, along with the other Skylanders were then immobilized when Kaos froze The Book of Skylanders solid, which in turn froze all the Skylanders inscribed inside. After the battle, Bad Breath was absent when the Skylanders rescued Spyro from Kaos and Glumshanks. Eruptor revealed that Bad Breath got so scared when Kaos attacked that he kept burping uncontrollably, causing him to leave the Skylander team temporarily.
Though he makes no major appearances for the rest of Season 1, he briefly appears in Beard Science as the only one left in the classroom for Eon's attempts to warn the school about his missing beard, as uninterested as the others. In The Skylands Are Falling!, the Grumblebum is nearly taken away by the world-destroying storm, just barely caught by a building wall when the winds pull him from the ground and a nearby lamp post.
- Bad Breath is a character created exclusively for the show, as a figure of a non-ideal yet comedic Skylander.
- Bad Breath made the pretzels in the Skylands Music Festival in Pop Rocks, however, because of his constant unhygienic state, Master Eon advised the guests to avoid his food once it was found out.