These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fanon: It's become fairly popular to depict Mega Man's clone with the scarf from "Mega Man?", to differentiate between the original and clone.
Game Breaker: Mega Man C has all the abilities of the normal Mega Man, in addition to the slide and charge shot. In fact, the charge shot here can break enemy guards at half power and at full power can go through walls. Protoman subverts this, as his cannon can't rapid fire or shoot through walls, but is just as powerful as the charge shot and hits as a weakness on every Robot Master. And while he takes double the normal damage, Protoman runs faster and jumps higher than the rest of the cast, and can use his shield to block a few projectiles.
Gutsman, while clunky in the actual stages, is capable of exploiting oversights in the AI for the other Robot Masters, such as trapping Time Man in a box or, even worse, rendering Elec Man completely incapable of harm short of running right into him.
It gets even more ridiculous in the final battle with Dr. Wily. Just build a 2x2 fort (2x3 in the second phase), with Gutsman on the left side of the topmost layer. That will make it next to impossible for Wily to damage you at all.
Fridge Brilliance: When Proto Man fights his Evil Counterpart, Proto Man's shield doesn't fly away from him when hit, why? He's the one who has the weapon, chances are, he knows how to defend against his own weapon.
Another bit of interest is that when Proto Man fights his counterpart, he shows a dislike of Joes. This is weird, until when you remember that the Joes are based on him. He hates Joes because they're essentially him without freedom!
Oh, and this means Wily Boss Rush mode is borderline Unwinnable by Design for Fire Man, as he has no means of re-igniting himself afterwards. And guess which boss comes next? Yeah, good luck beating Wily with the de-powered Fire Storm.
The look of the game was given some flak, and the games sales weren't that much, possibly because of the style, so they didn't try out an otherwise impressive remake of the first game, which is sad, more entries could have meant more characters to play as.
Adding the two new Robot Masters.
Three words on the subject as to why we won't see any more of the Powered Up games: Gamers are bastards.
Be fair, this was only released for PSP, which isn't exactly known for stellar sales in and of itself, except for the KillerApps.
The Scrappy: Ignoring the blackface design of the Japanese version, Oil Man is regularly disliked by players, who hate how impractical and useless his oil-shooting ability is.
Unfortunate Implications: Poor Oil Man. Even after bowdlerization, it's clear that Oil Man is supposed to be the stereotypical black person. In addition to the problems with the racist stereotyping, Oil Man is also saddled as the game's Scrappy for reasons outlined above. Worse still, his spot in the Rock-Paper-Scissors wheel is between Fire Man—the southern-speaking maniac who gladly lights him on fire in the name of justice—and Elec Man—the stuck-up pretty-boy who looks down on Oil Man as filthy and inferior.