Jet is a core member of Fairy Tail's Shadow Gear team alongside Levy and Droy. His real name is Sarusuke, though he goes by Jet—a nickname that pretty much explains itself once you know his magic.
His actual ability, God's Leg, is speed-based magic that kicks his movement into overdrive. It's exactly what you'd want if you're built around being the fastest person in a fight, and it's become his defining feature within the guild.
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