Right, Let's see how I handle something that isn't a series.

Rokko Chan is a fanmade flash game based on the Rock Man Series, Better known as Mega Man. The game plays much like Rock Man / Mega Man in that players start by selecting which boss they want to fight first. Each boss requires a different kind of strategy to defeat, And generally have a weakness to another bosses weapon. But. One does not simply teleport straight to the boss. The player must first jump, dash, & shoot their way to the boss by partaking in standard platforming-fare.

Once you defeat a boss and acquire their weapon. You can then use said weapon against the standard grunts in the levels or use them against the bosses, Or even both if you prefer. Keep in mind, though, that not every power-up you pick up will be the be all end all of power-ups. Some are just not very effective against certain bosses and enemies.

And finally, Once you defeat all the bosses, You have the distinct pleasure of taking on the ultimate challenge, Going through the castle of the man who created those bosses, Doctor Mad. His castle consists of the usual affair of harder platforming, harder bosses, & a full-fledged endurance run against the bosses you'd all ready beaten to get to Dr. Mad's castle. And then finally, Immediately following said boss rush, You get to fight Dr. Mad himself in whatever contraption he's created to fight you with.

Here be the site where the flash game is hosted.
king-soukutu.com/flash/rokko.html

And here be the controls just to be thorough.

Arrow Keys to move
Z key is to jump
X key is to shoot
C key is to dash
Shift key to pause and bring up the power-ups menu

Right, Now to bugger off again until the next suggestion. lol