I don't have Heet, Aria or Beatrix and close to Ava but I have the rest. I would say it's something like...

Warrior
Tanking - Eli > Beatrix > Helen > Suzume
Attacker - Beatrix > Helen = Suzume > Eli

Healer
Althea > Eli > Naku > Nuka

Other Mages/Support
Roxelana = Billie > Coral = Edana > Agni

Marksman
Zera = Micah > Ava = Aria

Engineers
Heet > Luna > Lapis