Nog

Moved with his father to Terok Nor, worked as a waiter at Quark's
Remained on the station when Starfleet took over, became friends with Jake Sisko
Mischievous & a slight delinquent, enrolled in Keiko O'Brien’s School
2371: Became the first Ferengi to enter Starfleet, sponsored by Ben Sisko
2373: Stationed on DS9 during his sophomore year as part of a field studies program
2374: Graduated early, & permanently assigned to DS9, as an engineer
Lost his leg during the siege of AR-558, got a biosynthetic replacement soon after
2375: Promoted in one of Sisko's last official acts as the commanding officer of DS9