Love it, I've read a few of these and you are talented. Some ideas I've had were Cyborg (DC) vs Iron Man (Marvel), Monokuma (Danganronpa) vs Raichu (Pokemon) and Grovyle (Pokemon/Pokemon Mystery Dungeon) vs Robin Hood (Robin Hood)

The nsxt battle is Red Hood vs Winter Soldier?

Not surprised King Boo won. But the I'm more exciting for next Fight: Red Winter.

Second time I've read this entire fic. I love it! Each battle is just as awesome, if not more than the actual death battles. I have a few suggestions for future battles that I hope you will consider. Thank you

(Legendary): Godzill, Mothra, and Kong VS. The Megazord, Green dragonzord and White tigerzord
The Knight(Hollow Knight) VS. Meta Knight
Master Chief VS. The Predator
the Xenomorph VS. Kravem the Hunter
Sonny(Irobot) VS. The Terminator
Sonic The Hedgehog VS. The Flash(Wally West)
John Constantine VS. The Ghost Rider
Ryu VS. Terry Bogard
Sans(Undertale) Vs The Ghost Rider(Robbie Reyes)
Jason Vorhees VS. Pyramid Head
Lobo VS. Deadpool

So next battle is King Boo vs Ganger, Neat.

KO awesome chapter, guess Widowmaker has the true marksmanship of a sniper showing she is more than a woman in skintight as the Sniper find out the hard way how deadly her kisses are.

KO awesome chapter, Vemon proves that even a blob ink monster is no match for the true black terror and I think I know who that first one is and I hope she wins!

The next battle is Widowmaker from Overwatch vs The Sniper from Team Fortress 2

Great story.
Your attention to detail is superb!
However sometimes I feel your characters need a little more development, maybe make the reader aware with motivates each character do be the character they are. Its your job as the writer to make it clear to the reader why they are the way they are and it's the writer who has to make it clear to the reader what are the motivations for each character. In your stories your characters just show up and the reader has no real idea why. Like what ever went down so that Sly and Joke ended up in a battle, that's what is not obvious when I read this. Other than that, I find it great and you are indeed a good writer.

Bendy vs Venom. Huh, neat

KO awesome chapter, I was not expecting Sly to
Win against a Persona User like that but it was cool that he won and showed Ren who’s the real around here.

Venom vs. Bendy... HELL YEAH

Alex Mercer vs Carnage and not the second game

Great story.
Can't wait to see what you come up with next.
I've been reading your work for some time and I think you need to come up with more original characters. Your grammar needs improvement and sometimes your writing mistakes take power away from your story. Sorry to be so direct, but I truly believe you have a great talent and if you improve on that, you can become an even better writer.

So Joker (Persona) vs. Sly Cooper. Well this be interesting