Each time Shido Brooke checks his mailbox, there's always a letter from someone with a time and a place, and that place is always a ring for him and the sender of the letter to throw down. Sometimes it's a name he doesn't recognize. Other times, he does recognize it and shits his pants. Each time, he still accepts the challenges. After each beating, after all, a grappler can improve himself.
Author's Note: Save for Shido himself, I own none of these characters. These fights are not to be taken too seriously in terms of "power scaling"(a concept I absolutely despise because it cuts out opportunities for defeats that aren't straight out overpowering in every aspect), nor are they to be taken too seriously in terms of where they would fall in canonicity of the stories these characters are from, nor in terms of where it would fall in timelines, save for some mini-arcs created within the narratives of these fights, at which point I will preface said fights with "Authors Note: This fight takes place blah blah blah." If you feel the need to offer criticism, please, feel free, as long as it doesn't regard any of the things I've already addressed. Like Shido, I can always improve!