*Cassia the Pronghorn is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. She is a mobian pronghorn, who has been subjected to Cyberization to get treatment for a fatal illness, and the sister of Clove the Pronghorn. Along with her sister, she is the regional Egg Boss of the Northamer Egg Army, although she does not hold the same amount of authority as Clove.

Cassia is a mobian green pronghorn like her sister, who she is slightly shorter than. She has curved, black-tipped ears, small black horn stubs on her forehead, and a dark green pompadour shaped like a stick of cassia (or cinnamon). Her pompadour has a darker green spiral on the front which is turning clockwise (counter-clockwise to the viewer).

Cybernetics have replaced her eyes and augmented her ears, as well as any surrounding/internal structures necessary to support either. Her eyes appear to be glassy black screens with yellow lights that can mimic eyelids and pupils. Her ears are metallic with glowing circuit lines on the inside and have yellow studs on the back, and she has a metallic muzzle with green studs on her cheeks.

She wears a grey Eggman Empire-styled uniform. Her version of the uniform consists of a short gray vest or sleeveless shirt, with the Eggman "white square strip" running down the center, over slightly baggy black pants. She wears gray fingerless gloves over an additional pair of black gloves that go to her upper arm. Her boots are gray and have white segmented strips in the center, matching her shirt, and have yellow rings around the top, matching her gloves. She attaches her tonfas to a white belt with a yellow and green spiral emblem in the center.

Compared to Clove, Cassia is vocal, hot-tempered, sarcastic, impulsive, and rather overconfident.[7] She has been described as "bratty" by Thunderbolt and talks down to people much older than her, calling Bunnie a "twerp" and sneering cheekily at the lazy Egg Soldier. She is friendly, talkative, and easygoing and seems to be well-liked by the Northamer Egg Soldiers. Cassia dislikes being weak or under-equipped; she blamed the purple Chaos Emerald's loss on shoddy mining and security equipment, claiming she could do a much better job, and expressed jealousy over Bunnie's armaments.

Despite her immaturity, Cassia does have a sense of honor and respect, as she let Bunnie go free as thanks for helping her out. She appears to be quite fond of her cybernetics, as they are responsible for making her feel better, and cheerfully references the idea of getting upgrades/further modifications. Cassia seems to be determined to prove she is just as capable as Clove thanks to her cybernetics, and she is deeply frustrated by feeling weak. She is somewhat sensitive about her illness and being wrongly judged by strangers makes her angry and defensive.*