I forgot all about Anemone, which is weird because I remembered other Knights with multihit attacks like Madonna and Kale when I was trying to figure out who hits the hardest. So it's currently Anemone, Kerria and Alpinia in the top three, right?
Nutaku and DMM IGN: Tomitain
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Nutaku Flower Knight Girl ID: 610834201 (inactive)
DMM FKG ID: 106750967
DMM FKG Allies: 109/123
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DMM Girls Symphony ID: 34644951 (inactive)
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Nutaku Mist Train Girls ID: 3355988
DMM MTG ID: MSTL0Q45K5E9
MTG Allies: 31/50 (Nutaku), 11/50 (DMM)
Don't just look at skills, because of Atk stats and Atk buffs Kerria is WAY ahead of anyone else both with and without her unique +damage based on hp buff.
Top 3 for single target skill damage are Kerria, Sakura, Anemone then Mei Plumblossom and Flowering Peach.
However.... Dusty Miller and Jersey Cudweed both have skills listed like Anemone... if they can hit the same target 3 times then they are stronger than Kerria without her HP skill, Jersey 1st then Dusty.
Flower Knight Girl: 255445855
The real question though shouldn't be damage on a hit-by-hit basis, but on the overall output. I just can't see Kerria losing to Anemone, DM or JC; sure the multi-hits and counters add up, but Kerria's ability to survive lets her do ridiculous amounts of total damage. I've seen multiple times this event where she would be the last one standing and end up dishing out 7M damage on her own on the L90 boss (not the Cauldron Spider though). For RB events with round limits, the others would probably perform better in the short term, but otherwise I'd take Kerria.
Just to play the Mei advocate again - once bloomed (under the DMM patch) Mei s Active skill multiplier skyrockets and becomes the highest of any girl.
Flower Knight Girl: 255445855
Speaking of Kerria it looks like all of her abilities are working now. I just had her deal 77k damage with her skill on a pest weak to slicing damage when before she'd only deal around 50k damage.
Nutaku and DMM IGN: Tomitain
--
Nutaku Flower Knight Girl ID: 610834201 (inactive)
DMM FKG ID: 106750967
DMM FKG Allies: 109/123
--
DMM Girls Symphony ID: 34644951 (inactive)
--
Nutaku Mist Train Girls ID: 3355988
DMM MTG ID: MSTL0Q45K5E9
MTG Allies: 31/50 (Nutaku), 11/50 (DMM)