Gavin has grey hair, violet eyes and fair skin. When using his ability, his eyes glow and his skin color turns grey-purple. He normally wear a Wellston school uniform without the tie, and his collar unbuttoned. John knows him as “stone kid”
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Gavin is a typical bully who bullies anyone weaker than him; he also holds a grudge against John for throwing him out of a window.  In later chapters, Gavin is revealed to be among Wellston's strongest mid-tiers and has been known to boss around weaker students and force them to complete his assignments.
When Gavin was bullying a low-tier for "speaking back to him", John saw him and attacked, giving the victim an opportunity to activate his ability and escape. Taking it as a challenge, Gavin tried to punch John, but his attack was countered. Gavin, enraged by this, activated Stone Skin and injured John, breaking the latter's arm. With John's provoking, he lunged at John, but was thrown out of a window.
When Gavin regains consciousness in a bush under the window, he swears to beat up John the next time he sees him, which happens to be a few seconds later. However, John is accompanied by his best friend Seraphina, who also happens to be the Ace of Wellston. Foolishly, he tries to attack anyway, but Seraphina knocks him across the courtyard and smashes him into a wall seemingly without moving or even making any effort to fight. 
Not even four hours had passed since Seraphina left before a revenge-fueled Gavin attacked John. Despite the latter's best efforts, Gavin successfully caught up to the "cripple" and proceeded to pummel him.
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