These different colored Duckys remind me of "The Mad Song" from LBT VIII! "Hold your breath / Until you're blue..." 
Does that mean red Ducky is “Turn red when you’re mad!” 
"And make your eyes self turn red!" 
I like this new side of Ducky.. “give into your anger!”
On a serious note, I think Ducky could be a little meaner at times, she gets mistreated by Cera who takes advantage of her sweetness. I woudn’t want Ducky to become bitter or cruel, but tough at times to keep from being manipulated and demeaned.