If we are talking about favorite event girls - my favorites are Canna, Threasure flower and Fullmoon Mapple (from aestetical point of view, i'm using them all on Nutaku) and Mountain lilly/Dipladenia can be good too from power POW, but i don't have them yet. The new Rainbow Rose seems to be a little imbalanced after rarity up. And if we are talking about good blue counter girl - i like Snapdragon. I have her on Nutaku and i like her very much. She has counter+evasion+attack up (no supercounter, but it's common for counter+evasion), and even more - she is one of several bloomable 5* on nutaku so she can reveal her full potential there too.