The Law of Purple/WMG

All Caligulans are Bisexual
At one point, Green mentions that if two guys are lost in the wilderness together, it is assumed that they're having sex. This indicates not only a lack of homophobia, but a widespread assumption that anyone is willing to sleep with someone of the same sex. Clearly, though, Caligulans are not all gay, as many are seen in heterosexual relationships.
 * Jossed

Maxwell Wevers is based on Pegasus.
He's got long hair that could be mistaken for white, he's the CEO of (or at least highly placed in, I'm not sure) soem company, and the author has already stated that Lette's design was based on Kaiba.
 * Confirmed!

Maxwell Wevers will eventually get a girlfriend who is an Expy of Cecilia/Cyndia or Ishizu/Isis
Jessi-sama has stated that she likes both Roseshipping and Sightshipping. While it's true that none of the other expies were romantically involved with counterparts of the originals' love interests, the others don't have as set love interests.

Most Caligulans are Bisexual
Jessi-sama jossed the all Caligulans are bi theory, and gave examples of ones who weren't. That doesn't rule out that bi is the most common sexuality, like straightness seems to be in humans.

Future characters will be introduced, who will be more Yu-Gi-Oh expies
She's done it before, she may do it again.

Rose's friend Kitty will end up going out with Stud
Kitty's one of very few women who treat him like a person, and he's currently staying with her.

Dahlia is based off of someone from Yu-Gi-Oh
Dahlia specifically denied being based on the Dark Magician Girl (I assume that's what DMG stood for). She never said she wasn't anyone else.

Law Of Purple will eventually have a whole pantheon
We've already seen Lette, the Goddess of Awesome, and Jay, the benevolent Egyptian godess of localized supermarkets.

Alicia Wyrd will find out about Jel and Max, and go ballistic.
Thae lady drove away her next-door neighbor because the woman was lesbian. She won't react well whem she finds out her daughter is dating another girl.

Lette's dragon mark's indistinctness is relevant somehow
It doesn't look like a dragon the way Blue's and Daimon's do. Also, it's apparently a birthmark, where the other two are reffered to as tattoos. And we know it's not that it isn't a dragonmark, because we saw Lette talking to her dragon.