Emm...hi. KudosForce told me about your fangame and, precisely, that you're taking suggestions for the story. So, I tried to take my own approach at the whole "Roll joins the battle!" idea.
WATCH OUT! BIG TEXT WALL INSIDE SPOILER TAG!
[spoiler]
INTRO
It is the year 20XX.
*black screen switches to Wily's lair, with him beging for forgiveness*
The seemingly eternal battle between the fighting robot Mega Man and mad scientist DR. Wily has finally reached a conclusion.
DR. Wily: "Please, forgive me! I won't do it again"
Mega Man: "The same old excuse, Wily. Aren't you getting tired of this?"
DR. Wily: "Well, in fact I DO! Let's finish this, shall we? GO, MY ULTIMATE COMBAT ROBOT!"
*scene switches to DR. Light's lab, with both Light and Roll on the scene*
DR. Light: "We lost contact to Mega Man! What is going on?!"
*DR. Cossack shows up on the screen*
DR. Cossack: DR. Light! We have some serious trouble!"
*Waltz's darkened figure shows up*
A mysterious robot mistress that calls herself "Waltz" has sent 8 robots to retrieve parts for a secret weapon! She has also taken Wily, Mega Man AND Rush as hostages!
*scene switches again to DR. Light's lab*
DR. Light: "How can we stop this madness? Mega Man has been captured and Proto Man is nowhere to be seen!"
Roll: "Ungh...maybe I can help!"
Bravely and following her brother's example, DR. Light equips Roll with a battle suit and modifies her Copy System to match Mega Man's!
Roll: "Now I'll show you who's the house-keeping robot, Waltz!"
Title screen, beat the 8 robot mistress, CUTSCENE YAY!
*Roll teleports into DR. Light's lab, only to find out he's not there!*
Roll: "Wow, this is such a mess. I am not going to clean this up!"
*Cossack shows up in the screen*
DR. Cossack: "Roll! DR. Light has been captured by Waltz before you defeated the last robot! She's apparently building a giant electromagnetic bomb that will disable all the Earth's defenses!"
*an explosion is heard at Cossack's lab*
DR. Cossack: "OH NO! ROLL, HELP ME!"
Roll: "Imagine all the cleaning I'm gonna have to do then! You're going down, Waltz!
Blah blah blah, Roll goes and defeat Waltz, only to find out that Wily was controlling her the whole time. Goes and defeats Wily. EVERYONE IS SAVED!
Staff Roll (lol), ends with picture of Waltz helping Roll cleaning DR. Light's lab. THE END![/spoiler]