Just like the gems but for guys and girls as Minervans and half gems can be either. 

Minervans are the native species that live along side gems much like how humans do. Minervans are vaguely reptilian and often have accents which song most like a Scottish accent as English isn't their first language. If you wanna say gibberish in minervan than be out guest lol

With this we can suggest roles for you we didn't t list here, which range from extras to proper characters