This is my topic. :D
-First off, my big dream is to make an animated Mario movie. Base it mainly off the games, with some slight nods to other iterations, such as the Super Show, the Peach-hime OVA, and even the live-ation movie. This film would establish Mario and Luigi as plumbers working in "the Big City" (from Donkey Kong 1994) who make their way to the Mushroom Kingdom and wind up having to save Peach from Bowser once they find out they were born there. Part of the movie is a Superman spoof, y'see, right down to an awesome intro sequence where the credits are flying through space amidst an epic theme song, except it looks a lot like Super Mario Galaxy.
-Second order of business, a Donkey Kong Country film. CGI rendered of course. If a big studio like Pixar would be willing to make it, that would be good. Anyway, the movie adapts the first game in the series with some slight references to later games and a few teensy bits borrowed from the DKC TV show. The plot is sort of a nod to adventure films such as Indiana Jones, where the big draw is the awesome environments DK and Diddy have to traverse, just like in the game.
-Third order. A live action Zelda pic. Personally I'd like to adapt A Link to the Past, and the plot could easily borrow from the Nintendo Power comic to set things in order, but naturally the thing to do would be to make a movie based on the most celebrated game in the series: Ocarina of Time. If I had to do a movie like this, I'd put as much care into it as the production staff did for the Lord of the Rings films. Hell, the game is so big and expansive I might just have to split it into three movies just to cover the whole thing.
-Fourth: A Metroid movie. Some would claim that part of the problem with Metroid is that it already borrows from the Alien movies. Thing is, Ellen Ripley didn''t have an Iron Man-style power suit nor was she the only human character in the whole setup. This kind of conflict would allow for a serious sense of isolation, just like in the game. The only other characters in the film besides Samus would be the Space Pirates, and they wouldn't even speak English. Yes, this movie would have very little dialog outside of a monolog by Samus at the beginning and end of the film. It would probably be hard to get it into production with this kind of idea, since several other attempts have been shot down, but with the recent success of WALL-E, it may have a chance.
-5th: an animated Kirby movie. It's been a while since the Kirby anime ended. Now this wouldn't be based on that though. It would be it's own thing, with plenty of references to the games themselves. I'm thinking of basing it on either Kirby's Dream Land 1/Spring Breeze or Kirby's Adventure and Kirby himself wouldn't have any dialog, again, sorta like WALL-E. Natrually there'd have to be awesome actions sequences and fight scenes where Kirby uses his Copy Abilities, so I guess the whole thing would be highly marketable, except higher quality than the Kirby anime since it's a feature film instead of a Saturday morning cartoon.
-6 on the list is a Star Fox movie. Given the recent plunge the series has taken thanks in part to *coughfurriescough*, I'd have to set things back to square one on this one. Base it off the original SNES Star Fox, maybe borrowing liberally from the Nintendo Power comic if I have to. The Star Wars homage aspect makes a pretty good contender. I assume it would be all CGI rendered, but had I been making this back in the 1990s, I'd have gotten Jim Henson's Creature Shop to build fully body puppets of the characters, like the Teenage Mutant Ninja Turtles films. Maybe there's a way to reconcile this...
-Lucky number 7. A live action Pokemon movie. My idea for this? Make it geared towards people who aren't kids, by which I mean people who are adults. Granted, I'm not gonna fill it with violence and cursing and sex and whatnot. What I would do is present it in the form of a fictional documentary, like that special about dragons on the Discovery Channel, or the "Under the Hood" documentary to be added as part of the Watchmen DVD. Characters such as Professor Oak could still appear in it as the experts on the subject, just like in actual documentaries. I know I'm probably taking a big risk with this idea, but if the CGI animators can succeed in making the Pokemon look like real animals without taking it overboard *coughtransformerscough* then I think it would garner much praise.
-Next to last, a live action F-ZERO movie. This would probably have more in common with the storylines of SNES F-ZERO and the Falcon Legend anime, rather than the GX storyline, lest we wind up with a another Batman & Robin on our hands. It's obvious that the movie would be a fast-paced futuristic racing movie, but unlike Speed Racer it would relatively serious as opposed to intentionally cheesy. Given how big the cast of the game is, I think a movie like this has tons of potential. The casting director would have a field day with it. :D
-Finally, a stop-motion animated MOTHER movie. At first I wanted to base it on Earthbound, but the tone of that movie is actually quite different than that of MOTHER or MOTHER 3, which would probably make for better movies as a whole. The marketing campaign would show absolutely no info on it at all in an attempt to garner public interest. The poster for the movie would just be a plain red box with the logo on it, just like the games' boxart. If I were doing an Earthbound adaptation, I'd probably have the trailer just show a scene like the one in the game's opening, with the flying saucers attacking the gas station. This would do a good job of throwing the people off about the movie's premise, which is what I intend for.
-I've always wanted to see an animated series based on the Oz books. Every episode would be based on a different book in the series, sometimes dipping into two or three-parter territory.
-I'd have Capcom make a Disney fighting game. They already hit it big with the platformers back in the early 90s, so now's their chance to hit big with fighting games that aren't already part of the Street Fighter or VS. series.
-In addition to the above, I'd have Capcom make a Hanna-Barbera vs. Capcom fighting game. Imagine, Space Ghost...Birdman...Captain Caveman....Blue Falcon....Frankenstein Jr. as the giant character. It fills my inner child with warmth just thinking about it. :D
-If Smash Bros. dies out, I'd have Monolith Soft make a massive Nintendo crossover RPG. They're really good when it comes to tying plots of different things together (read: Super Robot Wars, Namco X Capcom).