[@tobiax]

I mixed Penny, Ironwood and Mercury and ended up with Genos it seems like lol... 
Hmm Willow's last name is Greene which I thought could be possible as a plug in for a G. I know its customary to use first letter of first name usually... if it bothers you a lot, I can try again. Surprisingly hard to follow the color naming rule though. 

PS: You know what? I'm gonna try again. Already have someone using lime green and I've always imagined Willow having orange as color theme.