Leapers are large Decepticon brutes that jump around a lot and can only be defeated by being attacked from the back. Jazz doesn't like them that much.
The large and intimidating Leapers act as heavy melee troops in the Decepticon ranks. Although normally rather slow-moving, they can generate great bursts of speed for short periods of time, allowing them to deliver vicious charging attacks. In open-roofed areas, they can also live up to their names by jumping high into the air, creating a large, powerful shockwave on impact with the ground.
The front side of a Leaper is heavily armored, making head-on combat suicidal at best. However, like Brutes, Leapers are vulnerable to attacks from behind, due to the large engines on their backs.