i have been looking through all you Sailor Moon art and i have to say that its simply GORGEOUS! i really love your attention to detail in all of their uniforms. you even got that little detail on Neptune's choker, and all the lines on the top part of their outfits right! i haven't gotten through all your Sailor Moon artwork yet, so be prepared for more comments from me lol. lovely
chibi-usa was a senshi created by her mother to protect the future aka crystal tokyo, since sailor moon lost her senshi powers once she became neo-queen serenity. hence, chibi-usa is not one of the essential guardians in sailor moon like the inner senshi (who's duty is to protect usagi). once chibi-usa DOES become a "sailor moon figure" she doesnt work with the guardian senshi, and has her own team of senshi known as the sailor quartet. and the outer senshi have a duty to prevent sailor saturn, though later on that duty changes when saturn joins their force.
and well...mamoru's home planet is earth, it is suggested that endymion is the earth protector though he is a not a senshi.