Have you guys seen this???
This shows Takao Aoki's concept art for Bega's Justice Five! Since they weren't in the manga, I assumed he didn't have designs for them! It's really cool to see how different they looked before they finalized the designs for the anime! That's crazy that Brooklyn's hair was green! If you look through all of his early character designs on the website, a lot of their colors were different in the concept art.
He mentions that Mystel's design is meant to be Indonesian! I know some other fans and I were trying to determine what country he seemed to be from, and I don't remember if anyone guessed that!
He mentions Brooklyn being designed to be "the other Kai Hiwatari" which feels pretty accurate. None of these character designs were given names yet at that point, which brings me to the fact that the character we see here, who will turn into Ming-Ming is also the design that turns into Tsuki in the Rising manga, so it's like they're related! xD
Moses and Garland look pretty similar to their final selves, at least enough that I recognized them. Aoki also goes into the themes for the bit beasts and such. If you copy and paste the page's text into google translate, you can get all the fun details. Don't forget to try out the pages for the other seasons. You get to see his fun little thoughts that went into making the characters!