User blog comment:Rogue343/RUBY'S INTRO SONG. WHY SO MYSTERIOUS?!?!?!/@comment-3290441-20130220004331

Ruby is diffinitely looking for something or someone, her outfit is more of a traveler or nomad perhaps looking for something, any one of your three theories or a combination there of. The likeliest explanation is redemption, she had the demeanor of a trained soldier or a professional killer during the fight acting without remorse, hesitation, and even sadistic glee at one point.

Weiss is implied to be of royal descent by the Ruby song, as well as being burdoned by it. She acts more in a serious manner during the fighting, possibly from royal upbringing, her extensive combat training stems from the tradition of royal heirs being given millitary training in the event war should break out. Despite this her song said she was extremely lonely possibly from a isolated childhood, her singing career her attempt to seek attention from her peers.

The most popular theory reguarding Black is that she's a anti-hero, but her outfit is more in line with a entertainer like White. Reguardless Black is commonly associated with less than pleasant aspects and in typical anime fashion there must be a "bad boy/girl seeking redemption" and most people believe thats black.

I will admit I haven't thought a great deal about Yellow but it could be anyone of various fairy tale characters such as Rapunzel or Cinderella. Your idea of her being overly vain and or beauty obessed does make since but my personal opinion is that all the girls are equally pretty. But I do have a idea for a name for her, following the naming convention for both Ruby and Weiss in that their names are both a variant on their colors and start with the same letter Yellow's name is Yuric, scientific name for gold which is a shade of yellow.