[POTENTIAL SPOILER ALERT; YOU'VE BEEN WARNED]
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Preface: as she is a 5 star Harmony character, she is able to fit into almost every team comp, but here are my thoughts on which teams would be best suited for Robin:
1. FuA Teams
Her A4 trace allows an increase to FuA CRT DMG, which is great, especially if you have a FuA team present (Characters include Topaz, Dr. Ratio, Aventurine).
Overall DMG increase, allowing her allies to go more to deal more DMG, and dealing additional damage on top of every ally ATK makes her a viable and valuable support for FuA teams.
Rating: 4.5 / 5
2. Hypercarry teams (especially w/ Boothill)
Classic Hoyo where they market two characters that can bring out the best of each other. Her 100% Action Advance for all allies is perfect for allowing DPS to attack more.
However, the downside is that this 100% for all allies is only triggered upon ultimate. Most case scenarios, Bronya/ Sparkle will still have the slight advantage, since their Action Advance is triggered by their Skill.
Rating: 4 / 5
3. DoT Teams
Surprisingly, I feel that she can also fit here as well, as her ultimate boosts her allies ATK an amount similar to Jingliu's Talent. This boosts the DMG output that enemies will receive from DoTs.
However, similar to Hypercarry teams, if you have Ruan Mei, Robin isn't an absolute "must-pull."
Rating: 3.5 / 5
These are just my opinions from what I've been able to gather and evaluating based on the numbers from her kit. Once she comes out officially, we will see a better picture of where she thrived the most.
