Hello! So I'm here to talk about how the Upgrade would look like! Just to let you know, The Other Discussion is only for "SUGGESTIONS". I will go back to it to do the "Missing" Colors.

So The Doctors will be kept to their Respective Paths.
The Chapter's are the Same... But the Story is Different...

Dr. Light - Start with Mega Man - Normal Mega Man Story
Dr. Wily - Start with Bass - Timeline Story
Dr. Cossack - Start with Proto Man - Founded Story - YOU DONT START WITH COSSACK TILL MEGA MAN 4!
(This may be a FAN-MADE Robot Master but this is Just a "NEW" Name for it because its named "Base")
Mr. X - Start with Copy Man - Tournament Story - YOU DONT START WITH X TILL MEGA MAN 6!

Now here are the Difficulties

Dr. Light is Always meant to be the Easiest of the 4
Dr. Wily is the Next Doctor which is Unlocked after Beating him Once and is a Medium Path
Dr. Cossack is Unlocked in the MM4 Chapter after Beating Cossack Citadel which is a Challenging Path
Mr. X is the Last but not "ACTUALY" a Doctor which is Unlock in MM6 After Beating him and is the HARDEST Path of them all

Now here are their Difficulty Rule

Dr. Light is Normal
Dr. Wily has Stronger Robots
Dr. Cossack Doesn't give his Boost until MM4 but then Stronger Robots
Mr. X Same thing as Cossack until MM6 but then the "STRONGEST" Robots after

Now for the "SECRET LAST CHAPTERS"

It can be Unlocked until you have Completed every Path
After that, A New "PATH" Will Unlock which Includes Chapters 19 and 20
The "PATH" also lets you choose which Doctor you want to use!

And the Name of each Thing in Each Chapter is Called a PART

Now where did this "Base" Come from? Well... It came from MM8BDM!
Basically its another Version of Mega Man, Minus the Face...
The Female in Mr. X's Path is Named Copy "Women"
Genders Actually Exist in MM8BDM so that's why its like that...

(~ Continued Later ~)