I posted this idea on the Vault once, just reposting it again for posterity.
Imagine Bioshock 2's multiplayer mode...but with HHN characters, themes, and stages! The storyline is basically this: all of the icons are fighting a war for supremacy. Anyone can win. They just have to kill each other to rule all of Universal. The starting characters and their basic weapons are:
Jack The Clown-Spiked hammer
Albert Caine-Surgical scissors
Paulo Ravinski-Spiked camera tripod
Julian Browning-Flashlight
Samuel Meetz-Meat cleaver
The unlockable characters and THEIR weapons are:
Eddie-Chainsaw
Chance-Chainsaw
Tiny-Open fist
Terra Queen-Blade
The stages are ALL OVER USF and IOA. You can even fight in Citywalk! The splicers are scareactors of all shapes and sizes, Little Sisters are Cindy Caine clones and Big Daddies are members of the Chainsaw Drill Team. The weapons, plasmids, and gene tonics are all the same, exept for one. (More on that next...)
In case you're wondering where Elsa Strict is, she has another job: Saving your progress after each game in her book. And Bloody Mary changed the "Summon Eleanor" plasmid into "Summon Mary."
Any contributions to my idea? Praises? Filler?