The Thornbite's lower body is orange and resembles a flower pot or spinning top. Its head is spherical, black, and sports a pink flower on its top. Its arms, which sprout from either side of its body, are long, green, and thorny vines that end in dark green leaves. Its red eyes are set in a sorrowful expression. The Unversed symbol is on the back of the Thornbite's head.
In Kingdom Hearts Birth by Sleep Final Mix, the Thornbite receives a new coloration. Its vines become pale green, its head becomes dark green, and its lower body becomes predominantly white. The pink sections of its body, including its flower, become orange.
While Thornbites are weak, they can be quite dangerous in a group. A few Keyblade strikes is all that is needed to take down a Thornbite, but magic is also effective against these Unversed. Fire based commands such as Fire Surge, Flame Salvo and Firestorm are also a good way to take them out.