Martian Manhunter
Some alliterative ideas for Z'imm's codename:

Martian Menace
Martian Marauder
Martian Maniac
Martian Master
Martian Monster
Martian Monk
Mad Martian

Ooo, I like the Mad Martian. I don't know if I like it enough, but I do like it.

The Rebel Black Dot Song of the Day
Avril Lavigne, "Everything Back But You" from The Best Damn Thing (T.L.A.M.)

Emily the Strange
Emily believes...

...seeing is deceiving.