You go see GWAR, people die, it's as natural as rain on Sunday morning.
"It is I, ODERUS URUNGUS, lead singer of the sickest band in metal history, Earth's only openly extra-terrestrial rock band, and the destined destroyers of not only the human race but also reality itself. GWAR! Hulking, heaving, dribbling WAR-GODís who like nothing better than putting hordes of our sniveling fans to the sword while playing the marauding mutant metal that we are famous for! Star's of stage and screen, carvers of stem and spleen! GWAR LIVES!" — Oderus Urungus, GWAR Mythos''
"My quest for sex consumes all my life Being a God I do what I like"
Evil Versus Evil: On their quest to destroy all existence, GWAR often faces off against and destroys other evil entities.
Fictional Political Party: Their album War Party centers around a political party (named "The War Party") that supports policies dedicated especially to the eradication of the human race through global war and hatred. The party's symbol is said to be the "Krosstika," a combination of the Christian cross and the Nazi swastika, representing "two great hates that hate great together." According to GWAR lore, the political party has since disbanded.
Godzilla Threshold: During the Beyond Hell tours, GWAR has been beaten down and sodomized by Jewcifer. There seems to be no hope, except for when Gor-Gor comes and eats Satan. Gor-Gor then tries to eat GWAR, but is killed by Oderus.
High-Pressure Blood: A staple of their live shows. Lampshaded by Sleazy P. Martini in "The Gwarnage Campaign".
"Wow, look at all the PSI in his main aorta artery."
Humans Are Morons: "Back on the road, it's no lie, stupid fucking humans pay money to die."
I Am the Band: Dave Brockie aka Oderus Urungus, as he's the only remaining founding member and the idea of the band was his in the first place. In fact, several characters in the band have had multiple people play them.
The Show Must Go On: During Tour De Scum GWAR had protesters on stage who blocked the show from happening. After asking if they are in show business (no? Well then get the fuck off the stage!) Sleazy P. Martini declares the show must go on.
A serious version of this trope occured when Cory Smoot (AKA Flattus Maximus) died while on GWAR's Fall 2011 US tour. Shortly after his death, Dave Brockie announced that the tour would resume as planned and that the character would be resigned permanantly in honor of Cory.
Take That: They bring celebrities and politicians on stage for ritualistic public execution.
Oddly enough, Oderus considers being killed by GWAR to be flattering.
Take That Me: When not taking pot shots at Earthlings, celebrities, American culture, etc, they take shots at themselves for being less-that-stellar musicians (at least in the early days), making fun of their cheesy props, etc. Not to mention they portray their characters as rather dim and bufoonish.
Meta, Dave Brockie maintains a blog on his website called "Stupid Shit That I've Done." It's Exactly What It Says on the Tin. Even by GWAR stadards, it's some impressive stupidity (usually involving drinking way too much).
One of the victims in Slaughterama is a Nazi skinhead.
Wharghoul is about an American zombie troop who joined the SS.
Sonderkommando's title is taken from death camp units.
KZ Necromancer mentions Mengele and a plot to save Hitler's semen.
Poor Ole' Tom was killed by Nazi skinheads.
Hitler's vomiting face and a Nazi soldier were in the flesh column.
Beyond Hell (and the tours following it) featured a half Hilter half Jesus. Jesus was a dick, but Hitler was (in Orderus' own words) pretty cool.
Ties into the song "Krosstika" from the War Party album, which states that "The swastika and the bloody old cross" are "Two great hates that hate great together"
Dave Brockie has pissed on Hitler's Real Life grave.
The Rival / Unknown Rival: In their fall 2013 tour with Whitechapel, Oderus brought up that Rob Zombie got GWAR thrown off the 2013 Mayhem Festival line up. This resulted in Oderus taking shots at Rob Zombie throughout the concert and yelling "FUCK ROB ZOMBIE!" Whether this is true or the band trying to stir up some drama is unknown though.