Einhart Stratos is a major character in Mahou Shoujo Lyrical Nanoha ViVid, known as a skilled martial artist and one of the series' central fighters. She is a proud, disciplined girl with a strong sense of honor, and she becomes a key rival and ally to Vivio Takamachi. Einhart is also the reincarnation of the ancient king Einhard, giving her a deep connection to the past and a personal journey centered on identity, strength, and legacy.