Is there a character tier list that people can refer to? I don't mean star rating or power level but rather, which characters you prefer to upgrade and use regardless of star rating.
T3 Harley is REAL!
Natara 
Jng 
Spondyl 
Flxffy
Offensive type will be
Best tier
Vincent (evil cap) , Karl, hermes
2nd tier
Rebecca, lapis ( only water offensive)
Defensive
Best tier
Nene, rico
Second tier
Captain and gerad
Bomber
Lantern
Helper
Akasha and sunny
So generally the higher the natural star of the heroes the stronger they are