So this post will be quite lengthy and much of it might consist of repeated topics, but I will try to cover all the relevant details as well as mention some notes about some common plot points for each series. And of course, it's still agreed we won't be splitting canon/continuity or cosmology or characters and what not. But just noting that the main cast is consistently much higher during certain series compared to others. And if there are too many keys to create, we may need to make multiple profile pages. Which may or may not happen after this, but there's still quite a few things that need to be said.
And since I ran out of time, I didn't collect many Imgur Album screenshots from YouTube videos, but there are direct quotations in the source for most of the wiki pages.
Canonicity Connections
As what has been brought up numerous times; there are a ton of games that reference each other back and forth. In which it pretty much starts with a lot of details originating from Paper Mario.
- Paper Mario Makes quite a few references to other Mario games
- Starting with Luigi's Diary
- Page 1 brings up Mario Golf, Mario Tennis, and Mario Party series using capitalized letters
- Page 2 references an upcoming Luigi's Mansion. And the quote is identical to what Luigi said in the instruction manual that comes with the game
- Furthermore, the character Herringway was writing a book called Paper Mario/Mario Story which matches which ever localization of the games title. And it is officially published by the time Luigi's Mansion takes place as he's shown reading a book called "Mario Story by Herringway."
- Page 11 also confirms a wish he made over a shooting star, which is one of the wishes seen in Star Hill in Legend of the Seven Stars; aka the prequal to the original Paper Mario.
- On Yoshi's Island, there are quite a few references to that game.
- Raphael the Raven appears in that game was was hinted at being a former villain; aka is was a boss in Yoshi's Island
- Village Leader said he used to attack Ravens and was once heroic; also seems to recognize Mario even if Mario doesn't recognize him because he claimed that, "He was just a baby when they parted ways".
- Other NPCs also made mention that the Village Leader also used to carry a young hero on his back. Though can't seem to find specific statements for Village Leader.
- In turn, there are references to the Paper Mario series in later Mario titles
- Goomboss from Super Mario 64 DS is the exact same character as Goomba King from Paper Mario; same design, recognizes Mario as someone who defeated him before and he got his revenge. Also recognizes Luigi similarly to what is explained in the Super Luigi Book series when course episode is revisited as Luigi.
- The blocks from Paper Mario appear in Mario and Luigi Superstar Saga and its remake and described as coming from "Mario's Past Adventures"
- Star Hill appears in Partners in Time and it's recognized as a place they been to.
- While it mentioned Luigi's Mansion; Luigi's Mansion is also canon to Super Mario Sunshine given E Gadd is the confirmed inventor of FLUDD and Bowser Jr's Paintbrush. The vacuum that catches ghosts is also referenced in Serina Beach Episode 3 and it's noted Mario gave the Pianta a strange look for mentioning that. Luigi's Mansion, Mario Sunshine, and Superstar Saga all respectively connect each other making E Gadd a pretty recurring figure ever since.
- Koopatrols appear in Super Princess Peach
- Paper Mario: The Thousand Year Door also references a lot of past Mario games. Though only one seems very plot related outside of more obvious ones.
- Aside from it being a clear sequel to the original Paper Mario, there are evidences of it taking place after Super Mario Sunshine; Piantas recognize someone looking at him doing "Funny business at Isle Delfino". A minor thing on paper, but it gives hints.
- Super Paper Mario basically introduced us to Mario's version of Hell, that literally goes above and beyond with lore. Plenty old game references, but a lot of NPCs are defeated characters from old games.
- In Mario & Luigi, Superstar Saga also has story follow up details from other Mario series games
- E Gadd appears and recognizes Luigi as well as his fear of ghosts. He also had inventions such as Poltergeist 4000 and Gameboy Horror SP; which are stated to be upgraded versions of Poltergeist 3000 and Gameboy Horror from Luigi's Mansion.
- The first NPC Toad also takes to Mario that basically implies the game takes place immediately after Super Mario Sunshine where he just had "A long vacation".
- Partners In Time also continues the trend with E Gadd being the same one from Luigi's Mansion
- The past version of E Gadd moves to a place called "Boo Woods" which the present older E Gadd confirms where he eventually meets Luigi the first time; confirming the plot of Luigi's Mansion did canonically happen.
- Never played Captain Toad's Treasure Tracker, but this is another character with a notable history.
- It may be his own spinoff game, but it's a follow up to 3D World
- Future games such as Color Splash and Super Mario Odyssey also make note that imply Treasure Tracker's events happened
- Super Mario Galaxy also marked the first official appearance and when Mario recognizes him
That mostly wraps up all I need to say minus specific Imgur screenshots and/or YouTube video links which is why I don't think this is going to sway anyone. But there's a lot of back and forth information that the classic Paper Mario games, Luigi's Mansion series, Mario & Luigi series are all connected to each other with the sports, party, and kart games thrown in as Luigi consistently states in the Paper Mario series that he has experience doing those things combined with TTYD being the first chronological appearance of Toadette and when she first meets Mario, then later appears in Sports, Party games, Mario Kart, and even New Super Mario Bros U Deluxe. Then Sticker Star was the game that made Paper Mario dull, with Color Splash making some effort to pick up pace characterization and story wise. Paper Jam's Paper Mario is an outlier as it's implied they were born when the book was opened, and Color Splash mentions all these "Alternate Dimensions" and "Parallel Universes", but it also has a lot of connections.
Others already covered Yoshi's Island series being official prequals to the mainline Super Mario series + Paper Mario ect. The Seven Star Children plot is still something officially canon across all Mario series games. Including the 7th star child being born during the credits of Yoshi's Island DS is the same Yoshi who regularly appears in the various Mario Party, Sports, Kart, ect and the first Yoshi the Mario Bros meet in the introduction to Super Mario World.
Wario Land was already covered as an official sequal to Super Mario Land series. As for Donkey Kong and Donkey Kong Country; Nintendo used to always say Cranky Kong was the original Donkey Kong and the grandfather of the one who all know and love. But there have been contesting given the Mario Vs Donkey Kong series still has Mario and Pauline being in the 20's with it being Modern DK and not Cranky who kidnaps her. And we sure aren't using Game Theory's idea of Jump Man actually being Mario's dad with that Pauline being his mum. And it's more implied Donkey Kong as opposed to Cranky Kong was the Star Child.
Power Tiering Notes
I'm not going to go over every single feat and what not here but that's for a different topic. But I will say that while Mario is often inconsistent, there should be some notices on what is consistent. The RPGs especially are very consistent in implying Mario does get much stronger as the story progresses; he often goes from being extremely fodder compared to the main villain but later turns the tables throughout his journey. Not just ones with level up systems, but so do Color Splash and The Origami King. Though, resetting to level 1 next game is often a game mechanic and there are other RPG verses that have those issues which shall be unnamed for the avoidance of whataboutism, but it's still a consistent RPG trend.
There are statements I've heard for Mario 64 DS about Mario getting stronger as he collects power stars. It's also consistent in Galaxy where Mario couldn't reach or catch Bowser initially, but was able to catch up and over power an massively amplified version of Bowser later on. Even Bowser's Inside Story eventually has Bowser get much stronger during the course of his journey as he was initially weakened by his consumption of a poison mushroom, but it takes until the end to get his full strength back. It's also implied that the Dark Star is supposed to be far more destructive than any Giant Boss, yet Bowser matched and surpassed him in his regular form.
There aren't really any specific statements of Mario cast getting weaker, only ones that get stronger. Another example are the lyrics to the DK Rap. There are short implications such as the statement that Toad made in the beginning of Superstar Saga; in which he hoped Mario's "Long vacation he had didn't leave him out of shape", which of course is a nod to Super Mario Sunshine. There's no story based details of getting weaker, more so just game mechanics and plot convivence of Mario characters needing something to struggle. But some might make the argument that maybe the new threat was stronger than the last; but that's also contested.
So if there are going to be key splits, then obvious examples such as obvious direct sequels should consider Mario cast stronger in the sequels than in the prequals generally speaking; Odyssey Mario shouldn't be weaker than Galaxy Mario despite much less impressive feats who is in turn stronger than Mario was in Sunshine, Dream Team Mario & Luigi should be stronger than they were Bowser's Inside Story who are in turn stronger than they were in Partners in Time. And Super Paper Mario Mario > TTYD Mario > N64 Paper Mario > Seven Stars Mario. But even with canon connections, the connections Luigi's Mansion, Super Mario Sunshine, and Mario 64 DS have with Paper Mario and M&L series can often make things iffy.
Conclusion
I won't be swaying against the majority here, but it's been agreed there's no canon split, cosmology split, or entire character splits; with only exception is Paper Jam Mario is a different character form the original Paper Mario character and everyone else.
Any collected scans to back up my claims will be done in either smaller posts or on a new thread that I might make when I'm ready to retackle the revisions if I get there. But for now, let's just go with the Option A to split into series profiles with keys for games or eras within each series.