Definitely need to watch the anime now.
Rage of Bahamut does indeed have many 'dark' characters isn't it?
Apart from Jeanne and Luciella, it does have Ivurishia:-
http://wiki.rageofbahamut.com/Invaded_Ivurishia and Celia:-
http://wiki.rageofbahamut.com/Dark_Officer_Celia as well.