*Percival is essentially a doppelganger of her mainstream counterpart. As such, she is a lavender-furred, anthropomorphic cat with gold eyes, a small black nose and a white-furred muzzle. She has triangular ears with peach-colored canals on top of her head, two medium-length eyelashes on each side of her eyes, and a long tail with the end frayed and violet. Her fur is longer on each side of her head and sweeps slightly upwards. She has four plumes of hair with violet tips done up in a high ponytail by a golden hair tie with a piece of silver armor plating attached that runs slightly down the back of her head.

For attire, she wears a silver metal frame on her face with a lavender metal piece that has an adjustable visor covering her eyes, held in place by two golden circles. On the top of the aforementioned visor, around the forehead, there is a sky blue oval gem embedded in it. She also has silver and golden armor plating covering the back of her ears. In terms of regular attire, she wears a violet shirt and white leggings. She also wears a silver torso armor in the shape of a tailcoat over her shirt with a golden hemline at the bottom. This piece of armor has a golden collar, short shoulder plates, and golden edges along its lower flaps. Notably, Percival also wears additional metal bands around her right arm. Also, on her hands she wears metallic bright silver gauntlets with widespread cuffs that narrow in around the middle, a golden stripe on each wrist and sky blue oval gems embedded in the top of said cuffs. Lastly, she wears high-heeled bright silver shoes made of metal with rose toes and heels, and silver armor plating extending up her lower legs.

Like her mainstream counterpart, Percival is elegant, level-headed and noble. She possesses a refined and very formal behavior and a similar manner of speaking, having introduced herself to Sonic when they first met by telling him her name, status and master while maintaining a respectful demeanor towards Sonic despite him being her enemy at the time. While she holds a strong belief in her own swordsmanship, she is never outright arrogant or dismissive of others' skills with a sword, even offer commendations of her opponents' swordsmanship when it is due. She is also quite humble and respectful, as she would accept her defeat to Sonic with humility and grace while praising him for his performance.

While nowhere near malicious, as a knight, Percival has no qualms about taking a life in the line of her duty as a servant to her king. She was also foreign to acts of random kindness, especially from her perceived enemies, since she would question the benevolent Sonic of why he would safe her after they just fought for their lives in a duel. She also has a slightly bashful side to herself, as she would blush after witnessing Sonic's kindness towards her while Caliburn told Sonic to "save the hugs and kisses for later."

As one of the Knights of the Round Table, Percival strongly follows the code of chivalry. As such, she is a noble, dutiful and honorable knight. She is similarly endlessly loyal towards her appointed king, whom she will show the utmost respect for; to Percival, fealty to the king is the one and true way of chivalry. In fact, even after King Arthur's corruption, Percival followed his orders without question despite having concerns about the change in his nature and would note that without loyalty to their king, the Knights of the Round Table were nothing. However, Percival's focus on her devotion to King Arthur made her forget that being a knight not only meant serving her king, but also helping those in need and standing up for what is right. It was first after Merlina's rise to power and Sonic's words of encouragement that Percival regained her full understanding of being a knight and began serving the kingdom of England and its people as a whole.

Befitting her formal personality, Percival tends to speak old English, such as "Fare thee well" and "Surely you jest!?"*