Robin is a Halovian singer from Penacony. Thanks to her beautiful voice, this elegant and young lady has powerful supporting qualities.
ROBIN CHANGES EVERYTHING! Best E0 Robin Guide & Build [Best Relics, Light Cones & Teams] – Star Rail
To fully understand how powerful she is, here is the best Robin build in Honkai: Star Rail.
Robin is a limited 5-star character in Honkai, and with a decently stacked kit, she is one of the best supports you can get. She is a Physical Harmony support that provides team-wide buffs, regenerates health, increases CRIT damage from follow-up attacks, and helps the entire team move forward, making her very valuable and flexible. While her kit is broken, you should still equip her with the right Light Cones, Relic, and Planar Ornament sets to make good use of them, and invest in her Traces.
Even as a singer, Robin is still a capable fighter, so it's important to equip her with the right Light Cones. Since she's a physical support following the path of Harmony, you can only equip her with Harmony Light Cones.