I like Fairy Tail and Rave Master, I honestly like this one too though my one and only problem with it is that they look too much like his previous characters and I mean too much.
Shiki is basically a love child between Natsu and Gray.
Rebbeca is basically Lucy.
Happy is still pretty much Happy expect nicer to the Lucy character.
Elsie Crimson is Erza but as a Space Pirate.
But I still love the characters and the story, it still entertains me and makes me want to keep reading and I can't wait for this to kick off and get an anime series like Fairy Tail.