#1 - Kronii, literally hates men, militant feminist alphabet person.
#2 - Ayame, she's #2 only due to the sheer length of her career (relative to the other three) and frequency of long absences.
#3 - Sana, does not give a shit in the most literal sense of the term, multiple long and unannounced breaks without so much as a courtesy Tweet (on her work Twitter, anyway!)
#4 - Mori, still cares for some of her audience, she's just over the whole walking on eggshells for the sake of unicorns thing.