No More Mr. Nice Guy! is a song sung by Darwin in "The Words" when he goes overboard with being more direct. Darwin sings it at a lower pitch than his normal voice.
Lyrics
No more Mr. Nice Guy!
I've found a new style,
With claws, and pointy teeth, and a villainous smile!
Goodbye goody two shoes, I'm no longer uptight.
Cause now I'm a shark and I'm ready to bite!
And I'll say what I want, and the truth's gonna sting.
I'll be brutal and blunt, it's gonna hurt when I sing!
[Evil laughter]
So look out worl... [Cut by Gumball]