The best build for Robin Summeretto in Honkai: Star Rail is a mix of Rise and Sing Light Cone + World-Remaking Deliverer Relic Set + Amphoreus, The Eternal Land Planar Ornament set. Focus on HP and SPD for an ATK-Centric team, or boost her DMG instead of her HP for a non-ATK-scaling team.
Robin Summeretto is another powerful universal support who fits into most teams in Honkai: Star Rail. She can enter any team that needs a support, even replacing some characters as best-in-slot support. She's about as powerful as top supports like Mortenax Blade, Tribbie, and Cipher.
Here are some examples of Robin Summeretto team comps in HSR:
Rise and Sing increases Robin SP's max HP, which is the stat she needs the most. She also recovers 1 Skill Point for the team after she uses her Ultimate.
The game-changer lies in the second half of the weapon's passive. First, it's basically a free Sprightly Vonwacq, so you can opt for a more useful Planar Ornament. Second, the 20% SPD buff "only" lasts for 2 turns, but if you manage to put Robin in her Fever state before the 2 turns end, then ensure she never exits her Fever state, the 20% SPD buff can be permanent, as she will never enter her turn again.
Although this Light Cone is more offensive, Robin can still benefit from most of its passive, unlike weapons such as Make Farewells More Beautiful (Castorice's best Light Cone in HSR).
To Evernight's Stars boosts Robin SP's HP, and allows all ally memosprites to ignore 20% of the target's DEF.
When her memosprite disappears, Robin will regain 8 Energy, but generally speaking, you don't want Robin to ever exit her Fever state.
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