All of C. Y. Croc's books on SFR Station.
Xander Alien Halfbreed by C. Y. Croc
Xander runs a fighting dome with his uncle on the colonized Planet Desra.
Xixan and Nikki by C. Y. Croc
Xixan is a blue, bad ass ballsy alien. Nikki is a petite, pretty, perfect human.