An anthropomorphic armadillo, Mighty's body is black with red thick armor, which rounds from his forehead above to his lower back. His tail is black, like his body. Mighty's ears are side facing and funnel-shaped, and he has a medium-long and sharp black nose. Mighty's skin color, along with his ears, muzzle, arms and belly is tan. He also has interconnected, cartoonish, circular eyes with black pupils, and wears white gloves with sock-like cuffs. He also wears red sneakers with thick white soles, white cuffs, and white straps rounded off at each end, which do not reach the soles.

Mighty is a friendly, relaxed and welcoming person. He can be irritable, especially when under pressure. He's someone who while he loves a good fight, rather stay home with Ray and deliberately avoid danger

Mighty is very compassionate and loves to help people. While Mighty enjoys helping people out, he can get annoyed if someone he barely knows (Sonic and Tails) tries to help him out. He feels that this will land them both in danger, and his temper can get the better of him (like with Sonic). Mighty usually apologizes later though, showing that he doesn't mean to get angry.

Mighty's extremely protective of his allies, often quick to shield them or ensure they're uninjured. He is extremely protective of Ray the Flying Squirrel. Ray is the youngest Freedom Fighter and the most undefendable, so Mighty is the role of big brother and parental figure to him. He does what he can to keep him safe and has some rules in place to keep Ray away from their dealings with Robotnik. He is shown to become angry with Ray when he disobeys these rules and puts himself in danger, indicating how important Ray is to him. Though, when Robotnik strikes at them, the team can all count on Mighty to strike harder

Mighty is capable of running at high speeds, like Sonic. He also possesses a great deal of super strength; he is powerful enough to lift large rocks and hurtle them with ease, and even send Ray flying with a casual fist bump.

Said to possess remarkable defensive power, Mighty's shell is shown to be quite durable; not only can it protect him from attacks and projectiles, but it is also tough enough to take an attack from Metal Sonic's claws without receiving damage. Also, by curling into a ball, he can use his hard shell to smash through enemies.

Mighty can also perform the Spin Attack and Spin Jump, which are techniques where he curls into a concussive ball or cutting disk and directs himself at his targets. With them, Mighty can shred or burrow through just about any substance given enough speed. With his hard shell added to these techniques, Mighty is practically immune to any form of physical harm, however, fire and energy-based attacks can still hurt him.

Mighty carries a bag of rings to preform the Ring Attack

One of Mighty's best friends and his own sidekick. Ray shares a very close bond with Mighty and looks up to him like an older brother. Their relationship is portrayed with varying degrees, mostly like brothers, but also like parent and child with Mighty being more-or-less Ray's legal guardian. In fact, if it wasn't for Ray wanting Mighty to give Sonic and Tails a chance, they all probably wouldn't be friends. While Ray is indeed useful to Mighty in many situations, he can be a hindrance. Because he is very young and cannot defend himself, he is incredibly susceptible to being kidnapped by Robotnik and used as bait for Mighty. Mighty appears to know of this flaw and does his best to protect him, but his protection methods are often the reason why Ray gets kidnapped in the first place.

Compared to Sonic, Mighty's a lot more willing to accept Tails. But that's mostly because A, he's a kid and B he only saw Metal Sonic. Mighty interact more with Tails then he does with Sonic, mostly cause he has a hard time standing Sonic.