Has anyone actually tried out Water Diana on DMM? I managed to pull her but don't really know how to use her. She seems kinda slow to me but I'm probably just not using her right.

L. Athena is not slow though. 5T CD on abilities is quite fast for guard and dmg cut but unfortunately the damage cut is only 25%. With burst gauge increasing artifacts on other hime and L. Athena in the last spot she can burst rather fast.

One light R hime that is pretty useful which hasn't been mentioned here is Mikuru. She has increase 10 BG for everyone every 5 or 6 turns and 3 turns heal all for about 600 + damage (in lieu of attacking).

Val Baal's design is not that fantastic so I'll settle for Tish a-haha.