Board Thread:General Discussion/@comment-69.136.247.156-20151027043341/@comment-5414218-20151030160119

Not really, that could just be him being less expressive. He could be extremely loyal to Cinder but he has a more laid-back attitude.

Emerald is as willing to kill as Mercury is. Hell, she's been shown robbing for no real reason or necessity. It's just that their personalities might make it look like Mercury is more apathetic than she is, doesn't mean she's any different from him at the core.