General WMGs

Tuu Zed in 8 isn't the same one as in 2.

Granted: the Tuu Zed in 2 is October's son, while the Tuu Zed in 8 is his grandson and is even younger that the 2 Tuu Zed.
- Furthermore, in 3, there is A Tu, who is generally believed to be the same person as Tuu Zed from 2, and he has grown up and received a name change to indicate that he has grown up. So it's normal that both exist.

Richmond from Fight is also the Mystery Man from 11.

They have similar color scheme (dark red hair and white outfit.) They even have similar voices!
- He might also be the "King of Gambling" that has defeated Big Gamester in 7, considering that when he appears in 8 with a full body, he also dresses like that. Supported even further by the fact that he is set to be another gambling master who likes manipulating others like Big Gamester in Fight even though the dev hasn't proved it yet.

Ludwig has a relationship with Margaret from 3.

One of Ludwig's lines says "Margaret says that this good.". This means that he might be related to Margaret officially. Furthermore, Ludwig looks like he might originate from Germany based on his obsession of potatoes, making the relationship more likely (since Margaret is also a German).

Alice from 6 is actually the Angel from past games.

Since Angels before 6 are all female with golden hair, but they have become male later.

The Richman universe is the same universe as Mahjong Flagship Hellow Jacky, or at least connected to each other.

The proof is obviously Yiwana from Mahjong Flagship Hellow Jacky universe. She officially appears in 8 (although not shown, the game outright says that she is there) and the discontinued Richman Universe Online. While Nicole from Xuanyuan Sword universe also appeared in Universe Online, she does NOT appear in any other main games.

Richman 11 Updates and Story prediction WMGs

11 won't have any other returning characters.

As of version 1.0.9, all new characters are new characters while some of them also bear resemblence to some old characters: Eleven bearing a slight resemblence to Coolva and Lanai from 8, Bear being an "evil" version of Johnny from 6, and Silence and Sherry look like they might have taken references from Sword and Fairy series or Xuanyuan Sword series. It's likely that 11 will not add any other returning characters following this trend, but only new ones.

Margaret might return in 11.

Ludwig mentions her name when using Watertight card.
- It's likely going to be jossed, since that's what Aya got in 10: she was only mentioned by Ninja when he uses Richness Average card.

Ludwig ends up in the Memory Album because he takes Margaret's invitation for some reason.

Doctor Y intended to invite Margaret as she made her debut in 3, but Ludwig somehow comes instead and gets trapped in the album along with the protagonists. The reason why he doesn't appear in the initial release is probably going to be because the protagonists find him later.

Some of the other human characters (Eleven, Bear, Yuan) secretly made their way into Doctor Y's Memory Album.

It's more likely with Bear and Yuan since these two characters are in no way friendly enough to be befriended by Doctor Y. Instead, they somehow gets into Doctor Y's Memory Album in another way, like Bear following a kid trying to bully them. Eleven might have accidentally entered the Memory Album when exploring too.

Sherry is on the good side too.

She is a good (if sometimes harsh) goddess that tests the protagonists to see if they're worth her power. In the story, the protagonists will find her and ask her for help, and she would agree to grant them the power they need to defeat King Octopus if they defeat her.
- She might actually be the mother of the real good gods (as the gods that appear in the game are actually Doctor Y's friends).