I only ever joined comedic small supergroups (AA for Heroes and League of No Pants, for example), but I teamed enough to recognize a few names in here. Holy nostalgia! :D
Anyway, I was:
Jurassik Rubble - Granite tank
Archangel Miguel - Peacebringer
BAAAH - Big dumb goat
Dingo Jones - No, I didn't eat the baby
Oh yeah, and
the Earl of Pastey - the pantsless hobo and self proclaimed "Sorceror Inferior of Triumph"
Type R Hunter - AV/GM hunting MM