Here's another one:

A Wizardry game that uses the mechanics of the early games (1-5), but which has all the classes from later Wizardry games, including the Gadgeteer class.

Also, I would like to see a game like Wizardry Summoner, but with more sane game balance. (It takes *way* too long to level up because the developers switched XP and GP awards; this also means you get more money than you know what to do with.)

Yet another idea: A remake of Final Fantasy 4, but with mechanics from the SaGa series (get rid of leveling, add stat growth based on actions and technique sparking; who wouldn't want to see Rosa use Rain of Arrows?).

This one has been in my mind for a few years now. I honestly think it would be at the very least a cult hit (if done right):

8-bit Ninja Gaiden Metroidvania. Simply a 2D Action Platformer with the same identical visual style as the NES Ninja Gaiden games (minus the typical NES visual glitches), but where you free roam in one large 2D city, with entry points (buildings, houses, factories, park gates, subways, etc.) that take you to sub levels. The overall game design could be organized similarly to Castlevania: Order of Ecclesia, but you never get the level selection as you actually have to go from place to place within the city. As you progress, new abilities will make your wondering around faster and easier, obviously. It would have to include minor RPG elements, like leveling, in order to keep things interesting. You could also have some level of GTA style diversions, like having random events happening in the city.

Strange idea:

How about a game that combines Gone Home, Tetris: The Grand Master, and Call of Duty into a single cohesive game (that is, without switching from one "mode" to another)?

How this would be done is left as an exercise to the reader.

(Note: I have not actually played any of these games, and the only one I am actually familiar with is the second game in the list.)

Not sure what is The Grand Master, but from the other three I get a game about a reservist called up for duty on short notice, and he has to race home and pack all his gear into his duffle bag in order to make muster on time with a complete kit.

You left it up to the reader, and this particular reader had a dumb idea. ; )

Online multiplayer one: one's a western newbie dude trying to climb the Chomolungma and other high peaks and the other's a sherpa or something guiding him/her, each one with different abilities and such ;p

Local co-op: something related to the Genesis/Snes Battletech game, whereas one controls the leg and torso while other fires. Love that concept!!

It's actually the subtitle of a particular Tetris game; the full title is Tetris: The Grand Master. That particular Tetris game (and its sequels) is known for being insanely difficult, particularly once the gravity increases to the point where blocks start on the bottom of the well (or as far down as it will go due to other blocks in the way). You should really watch some videos of it; the difficulty does get ridiculous (TGM2 has a mode called "Death"; think about that).

Silly me, I read the colon as a comma. Thought you listed four games. Been a long week.

Thought of another: A 2D Sonic the Hedgehog game in which the final zone is Green Hill Zone.

(For those unfamiliar with that series, Green Hill Zone is the *first* zone in the original Sonic the Hedgehog.)

I want a fully faithful to the source material adaptation in RPG form of the Piers Anthony "Robot Adept" series of novels. If you haven't read it, I won't spoil it or get into the nitty-gritty detail, but it takes place on parallel worlds, one based in science, the other in magic (its like one side of the world is from Logan's Run while the other side is from Lord of the Rings). They are separated by a thin dimensional barrier that some people are able to cross by swapping places with their alternate. Each world is filled with various sci-fi and fantasy creatures, where beings like androids, aliens and cyborgs have magic world alternates in creatures like centaurs, werewolves and dwarves. Both worlds have a very deeply separated class system where a very small elite rules, often brutally (or at least cruelly indifferently) over the majority in the lower classes.

I've always thought that setting would make for a fantastic old school pen and paper RPG, but the alternate dimensions would make developing scenarios pretty difficult. A single player RPG that follows the story from the books, on the other hand, could be very doable. There are many more parts of the books that would really fit well in an expansive RPG format, such as an ongoing tournament of skills in the science world, the ultimate goal of which is class elevation. The individual matches can be in any skill, not just athletics or fighting, but even things like solving equations or knitting. The matches are also run for simply entertainment purposes, so I can totally see that becoming a kind of mini game in an open-ish RPG world. The only potential issue is the books do include some rather mature content (part of the class separation in one world bans lower classes from wearing clothes, and pretty much demands that lower classes consent to every upper class request, no matter how vile), but if handled correctly, could at least get onto Steam these days.

I think I still want FF7 remade as a 2D platformer (no RPG elements); just watched someone play through the beginning of the game (she saved and quit after the first boss fight) and the first dungeon's design would lend itself well to being a platformer.

Incidentally, FF6 has a few parts that would work as a platformer (phantom forest/train, zozo, triangle island dungeon, maybe fanatic's tower (with appropriate rule changes) could work). Of course, I am not sure what the best way to handle FF6's nonlinear second half would be. Earlier FF games, on the other hand, are less suitable due to the fact that each floor is rather flat.

A Wild West RPG with customizable (including gender) protagonist, leveling, dialogue trees and party NPCs with approval meters.

How about an RPG with the game structure and growth systems typical of a Metroid game (in other words, you get stronger by finding things rather than by winning battles), but the battle system of a traditional turn-based JRPG?

If you want a game that will REALLY REALLY REALLY get your adrenaline going..... make a Fallout 4 like game with the Survival mode and if your character dies.... you die.

There's some real realism for ya.

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Make Gravity Falls into an Adventure game.

Continue the show's story, mystery.
Look for hidden clues and secret codes.
.
Outsmart the crazy Gnomes, lure in tourists,
and solve puzzles to send Bill Cipher back
to where he came from, for good
.
Explore the Mystery Shack and it's hidden rooms/exhibits.
Converse with Grumple Stanley and the twins, Mabel and Dipper.
Continue their adventure and explore areas and characters
they haven't yet met.
.
Hunt around for Bill Cipher.
Solve his riddles, look for clues, defeat him with logic
.