From Chapter 3 of Equestria Ninjas: Friendship School.
 
Just like she did to the Young Six, Cozy Glow makes unflattering statements to the Ninjas about the mistakes they made or flaws they have.
 
Like Fugitoid building the Black Hole Generator that doomed the Earth.
 
Donnie on how he and his brothers accidentally spilled mutagen that mutated April’s dad, turning him into a bat, and making April turn her back on them.
 
Karai on how she’s part mutant, reminding her how she let Shredder manipulate her and, eventually mind control her and making her do terrible things to her real family.
 
And Raph on how he get’s angry when he looses a spar.
 
“Which is more often than you think”