All of Them
-24 and a half minute episodes, including anime style opening and ending sequences. They won't always have vocal songs, though, especially in the Mario series which has somewhat of a shortage of them.
-Full voice acting. Aiming for it to be as good as possible by fans.
-Will have remastered soundtracks. This means the tracks will be redone with different or similar instruments, but remain faithful to the originals. Not like OCRemixes. Every track from the games adapted will be remastered and used. This includes different variations of tracks. Such as the NES and SNES versions of the SMB Overworld theme. They would both have their own separate reversionings.
-The music is franchise and arc appropriate. You won't hear Mario tracks in Kirby Retold or Kirby tracks in Sonic Retold. You also won't hear Paper Mario tracks before the Star Rod Arc. You will hear them again afterwards, however. Tracks will be reused more than in the games, generally.
-Regardless of the above, vocal songs will be left as is.
-Regarding the term "elements" as used below, it means I use characters, locations, and remastered music from those sources.
-There will be NO fan characters....sort of. Certain characters who are talked about but never seen will be given original designs and even names in some cases.
-There will be no fan pairings, only ones with canon basis behind them.
Super Mario Retold
-Will have influence from non-story spin-offs such as Mario Kart.
-Will use influence from the Japanese movie and OVA.
-Will NOT use any influence from the DIC Cartoons or the live action movie.
-Will NOT have the recent announcement of Mario & Luigi: Paper Jam affect the placement of the Paper Mario games in the same continuity as the rest. The story was simply way too far along and tightly woven for me to write those into a separate continuity. The Paper Jam storyline itself, when we get there, will most likely be heavily rewritten. Either way, it's Post-Galaxy, and I haven't planned that far yet.
-Mario will talk.
-Peach Toadstool is the Mushroom Kingdom Princess's full name, but she will almost always go by Peach.
-King Bowser Koopa. Koopa is the clan name, and Bowser is his name that he goes by.
-The Goomba King, King Boo, King Bob-omb, Wart, and their troops are allied with Bowser, but don't work for him. Only the Koopas and Hammer Bros. directly serve Bowser.
-The Koopalings are not Bowser's children. This fixes Bowser's age inconsistency.
-Toads ARE gendered. Hey, I don't have to listen to every word of god out there. It's an adaptation, and changes are liable to happen.
Sonic Retold
-Will use elements from the OVA and anime.
-Will not use any elements whatsoever the DIC Cartoons or the Archie Comics. This decision will turn away a fair amount of the fans who grew up with those, but it's for consistency purposes, as well as them not being actual Sega productions. I'm leaning more towards the Japanese side of things in general, storyline-wise.
-Related to the above, Sonic lives on Earth, not Mobius, not Freedom, and not some random unnamed parallel Earth.
-Sonic Boom will have a separate adaptation, Sonic Boom Retold, and be treated as a separate continuity.
-The name Dr. Ivo Robotnik will be used for Sonic's archenemy, but only for the classic era. It's his real name, but some name calling leads to him taking on the Eggman name.
-Metal Sonic will speak when he feels like it. He will also occasionally use his full name from the OVA, Hyper Metal Sonic, as well as the nickname Metal.
-The Classic to Modern design shift is explained by a 4 year time gap.
-The storyline for Sonic 06 will be kept, but with changes to fix the glaring continuity errors. It will also not be erased.
Kirby Retold
-Will use elements from the anime.
-Will NOT have Kirby talk aside from his usual POYOs and attack phrases.
Galaxy Crossover
-Based on Super Mario Galaxy, Super Mario Galaxy 2, the Subspace Emissary, the 3rd Season of Sonic X, and the the finale of Kirby: Right Back at Ya!
-Follows Super Paper Mario, Sonic Chronicles: The Dark Brotherhood, and Kirby: Squeak Squad.