So, thanks to Magmacubesr0ck1, the Bakugan Official Handbooks have come to my attention. Turns out, this handbook has a lot of information. A bio, an evolution chain, and even a list of available Gs. Pretty much the holy grail for half of my data collection work. So far, I've found the Google preview for the Ultimate Bakugan Handbook, but that only has a handful of pages (and it keeps giving and taking away pages every time I refresh ¯\_(ツ)_/¯), and an image of two pages from the original, but that's not that much. If anyone has the full collection and would like to donate images of it, let me know, this is information we can use.
On a similar but very different note, I've been thinking about how to handle the fact that each Bakugan seems to be a species. I get the feeling that at the beginning, or the initial concept of the game and show, they had this idea that each Bakugan was unique, but since Nova Lion in Battle Brawlers, that's shown to be not true. I was considering doing something like the Pokemon Wikia does it, but that may lead to some issues and I wanted to get other people's opinions on it. (If there's even anyone here anymore)
Also, G or Gs? I'm having trouble finding confirmation for the latter... 😬