I know that I'm not the most popular of authors here, but there are just too many ideas that circle around in my head for me to do well enough. So, for those of you who believe that they can bring these ideas of mine to life, here are your choices:

1. Zack Gojira: In what would've been a regular 5th Holy Grail War, Shirou Emiya does what any NORMAL person would've done on that first night. QUIT! Unfortunately, that leads to him being turned into paste by his step sister and her Servant Berserker. Being the Vindicative sprite that she is, using Magecraft she tethered him to life, mostly so that she could torture him herself. With FakeAssassin's death, and the lingering taint on him from surviving the Cursed Grail's fire, he broke down and absorbed the Servant's energy instead of Illya due to proximity. Due to the emense stress born from his continued torture and absorbing Assassin, Shirou began absorbing the mansion's defense's store of mana. With Illya exposed, Rin, Sakura, and their three Servants came to bring Berserker down. As they passed by where what was left of Shirou, he, instinctually, started to absorb mana, and a few brief memories, from the Servants. Before too much could've been taken, Archer impaled the torn up body with a nameless blade, breaking Shirou's connection to Saber, Rider and himself. With nothing to lose, Shirou followed on regrown legs, using Archer's blade as a crutch. By the time they finished Berserker off, the mansion was coming down due to its mana being all used up. In their rush to get out, none of the Masters, or Servants, noticed Shirou's disappearance. Due to the massive build up of mana and having absorbed Assassin AND Berserker, what was Shirou was taken to the Grail. Having experienced Hell not just once, but TWICE, he roared his desire to live and being amused by his circumstances, the Grail responded to his wish. Not with a Hero, but with a Beast.

For this challenge, the story will be a crossover due to Shirou, who now calls himself Zack, having a instinctual desire to wander, sleep in isolated areas, and beat the crap out of anyone who annoys him, mostly due to inheriting those instincts from Godzilla. Despite what this would suggest, Shirou/Zack isn't a spirit, but more akin to a Demi Servant similar to Mash or Sieg from Fate Apocrypha, just without the downside of his body breaking down. Obviously, the, "Servant," who answered Angra Mainyu was Godzilla. This, and Angra messing around, physically leaves Shirou with black hair, green eyes and slightly tanned (lighter than EMIYA) skin. Zack dislikes everything about who he once was, and that dislike extends to Rin, Saber, and EMIYA, however he especially LOATHES Illya for obvious reasons. Despite this, he is no brawny idiot. In addition to being able to transform into his savior's likeliness and partial beastial transformations to aid him in melee combat, Zack retains his usage of tracing and instead of a Reality Marble, Gaia has seen fit to aid this Animal by evolving his mentality with a Marble Phantasm. I don't have any idea for a chant, but the MP is called Everevolving Jaded World. As a means of pissing off his Counter Guardian self, he warped the blade Archer impaled him with, and made it semisentient, thereby being unable to be added to ANY interaction of Unlimited Blade Works. Without turning into Godzilla, Zack is strong enough to match Berserker (Hercules), quick enough to match a fast Rider, and brutal enough to fascinate Kotomine (and probably Karen too :D).

Possible world's for a crossover in this challenge include RWBY, Killing Bites, Campione, Needless, Kingdom Hearts, Tokyo Ghoul, Persona, Digimon Cyber Story and High School Dxd. Other worlds not shown may work, but it needs to make a little sense. Or blame Zelretch, because that always works.