Yeah, I was pleasantly surprised to see some of the GS cast again. It's nice that two of the 'main characters' showed up but it's even better that she has a RG version along with bloomed art now. The Golden Melody system is interesting too and it makes me wonder if a similar system will be implemented for certain groups of Knights in the future.
Imagine the Ancient Sealed Flower Knights getting a system like that.
EDIT: Had a brain fart and forgot that Henri was a rainbow, not one of the main story characters.