柠檬少年凉堇年薄荷少女暖夕夏
[níng méng shăo nián liáng jĭn nián bó hé shăo nǚ nuăn xī xià]
This translates into: Lemon Boy - Cold Lavender Year, Mint Girl - Warm Summer Evenings. It represents two characters in stark contrasts - one is cool and sharp like lemon and lavender while the other is fresh and warm like mint and summer evenings. The overall vibe of the username feels youthful and dreamy with a mix of emotions and moods represented by each object mentioned in this lengthy nickname.