Mbeya is a massive, stocky rhinoceros. He is dull blue in color, with two lighter spots and one darker spot on his cheek. Some spots (both lighter and darker) can also be found on his back. He has dark eartips with a pink inner ear and two white horns, the front significantly larger than the other. His eyes are pure black.
Not much of Mbeya's personality is shown, though he appears to be very loquacious, friendly, polite, talkative, magniloquent, communicative, unreserved, and chatty. He is also claimed to know the Pride Lands "like the back of his horn".
After Kion is swept across a river into the Outlands, he instructs the rest of the Guard to meet him at Flat Ridge Rock. As a result, the Guard seeks out information from Mbeya, after a suggestion from Beshte. He and Beshte talk for a while, but the Lion Guard becomes impatient, insisting that Beshte stops his conversation. Beshte recalls that he never did ask Mbeya where Flat Ridge Rock was as they were too busy discussing a recent heat wave, and goes back to Mbeya do so.
On the day of Kupatana, Mbeya winds up stuck in the mud at Lake Matope. The Lion Guard rescues him, and Mbeya is seen thanking them and receiving reassurance from Kion, whilst Ono hopes that next time he won't get stuck in mud that is quite so sticky.