If they bring them back for Mixels Rush, here are my ideas for Upset videos:
Rokit: Angry, shoots lasers constantly, destroying background and making him fall off-screen.
Niksput: Angry, forcibly hits his jetpack and gets sent flying off-screen.
Nurp-Naut: Sad, switches between faces a few times quickly and settles on young (Old side is just sad, and young side is crying)
Meltus: (Dadaw)
Flamzer: ???
Burnard: Sad, cry-laughing
Globert: ???
Vampos: (Hyperealistic Gaben)
Boogly: ???
(Any ideas for Meltus, Flamzer, and the Glowkies?)