Billy Butcher vs Stain
Connection: Two killers of superheroes from two different franchises, are about to clash in a fight to the death.
Gordon Freeman vs Billy Butcher
Connection: Two beard crowbar wielding characters from two different franchises, are about to clash in a fight to the death.
Yoshikage Kira vs Billy Butcher
Doom Slayer vs Billy Butcher
Connection: The connection between Doom Slayer and Billy Butcher is these two are killers who have many weapons...and many ways to kill enemies.
Vile vs Billy Butcher
Connection: Maybe same with Doom Slayer
Nemesis (Icon Comics) vs Billy Butcher
Kick-Ass vs Billy Butcher
Red Hood vs Billy Butcher
Connection: Two murderous anti-heroes from two different franchises, who're capable of battling those with superhuman abilities despite having no superhuman abilities themselves, are about to clash in a fight to the death.