Alternate title screen
Defeat any Boss in New Style mode. Use that Boss as your character and load the game to have the corresponding person at the title screen. Defeat all Bosses in New Style mode and select Megaman as your character to have all characters appear.
Misspelling
Successfully complete a level on the Normal difficulty setting. Sometimes Roll will say "Try your best on the next stage kay." instead of "Try your best on the next stage okay."
Play as Blues/Protoman
To play as Blues/Protoman you must complete all 100 of the games challenges.
Play as Bosses
To unlock a Robot Master as a playable character, you must defeat them in new-style mode using only the Mega/Rock Buster.
Play as Mega
Successfully complete all levels on the Hard difficulty setting to unlock Mega. He is Megaman in his basic helper clothes and attacks with a kick. To choose him, select Megaman at the character selection screen and use the menu that appears to play as him.
Play as Megaman C
Successfully complete New Style mode on the Normal difficulty setting to unlock Megaman C.
Play as Rockman S
Successfully complete New Style mode on the Easy difficulty setting to unlock Rockman S.
Robot Masters
Beat him in new-style mode using only the Mega/Rock Buster.
Unlock Charge Shot/Sliding
Beat every stage on normal.