A side-scrolling platformer-RPG that would be a cross between Ratchet and Clank and Paper Mario. You play as a turtle that flies around the world in his bad*** airship (a turtle; imagine that!) and fights crime with a variety of weapons (some futuristic, some more medieval). I'm thinking a toad or frog for a sidekick that pilots the airship and would maybe have to rescue the protagonist from a tight spot or two.
As you gain experience, you get stat points when you level up that you can spend on any particular stat, allowing you to influence which stats get the most points, like the Pokemon games (unlike the Pokemon games, it's a more direct influence and you wouldn't have to mess with EVs; there's also no limit to how high a stat can go, so you can make a specialized character with insanely high attack and poor defense for example).
The sheer number and upgradeability (is that a word? Spell Check doesn't think so) of weapons is where the Ratchet and Clank influence would be clear (and possibly in the comic mischief); there would be a lot of weapons, all able to be leveled up into deadlier forms. I would also implement lots of different types of armor and defensive equipment with similar mechanics. The enemies would also power up to accommodate the player's increase in power, of course, so as not to make the game too easy.
Like Super Paper Mario, however, it'd be a side-scrolling platformer-RPG as far as controls and layout go, with battles and item-collecting in real time and the ability to shift focus from gratuitous gun fighting to heavy platforming at any moment (it'd be closer to the R&C games in terms of difficulty, though - somewhere between Going Commando, which was effin' hard, and Up Your Arsenal, which was slightly on the easy side). The story would be of middling length, with the real challenge to 100% completion coming in the form of side quests, and OH YES, there will be side quests.
Graphics would probably be cel-shaded (the characters and levels would be fairly cartoony; think the Sly Cooper games), and music would have a decidedly techno/trance feel for the most part.
Is any of that confusing or grammatically incorrect? Because it's hard to convey my thoughts on the matter into a systematic post.