For years, Pyongyang's state media never mentioned Kim's children -- Seoul's spy agency believes he has three with wife Ri -- but he unveiled daughter Ju Ae at an intercontinental ballistic missile launch in November last year.
Since then, the 10-year-old has appeared alongside her father at multiple high-profile events, most recently a banquet Tuesday to mark the army's founding anniversary.
Analysts say she is the equivalent of a North Korean "princess" and that her constant appearances with her father could indicate she is his anointed successor.
Kim Jong Un's own father, Kim Jong Il, selected him to be his successor over his elder children because he most resembled him.
North Korea has held four night-time military parades in recent years -- including the latest one.
The parade comes after North Korea vowed to expand and intensify military drills to ensure its readiness for war, following a record-breaking year of weapons tests, including firing its most advanced intercontinental ballistic missile.
Kim recently called for an "exponential" increase in Pyongyang's nuclear arsenal, including mass-producing tactical nuclear weapons and developing new missiles for nuclear counterstrikes.
