If you have no moderator, this isn't really fair. Do you have a moderator?
Deathmatch Central

B. See below
C. You don’t even know where I am. You don’t even know WHO I am. And you certainly don’t know WHY I am. So, denied.

By no means! I'm not exactly sure what half of the things are that you guys are referencing here, anyway. The games that I want to run have much more form to them (Mafia Returns). I could pretty much sit back and watch everyone play Mafia Returns with no intervention apart from the night actions and role reveals. This is so open that I just cannot moderate it and be happy with it. I can't come up with a way to let you roleplay various characters in a team deathmatch like you want. The closest thing I can think of that this approaches is Smash Bros, but it doesn't have the characters you want to play as. Therefore, I can't really help you, since you want the freedom to play your character (obviously), but I want rules and guidelines to ensure fairness and balanced teams.

“I’m not DD. I’m the Narrator! I switched for this round.”

“Only half of this is true. Oh, wait! I create another Leo. There we go. Leo! You can come back.”
“Please describe how you destroy me. Don’t you know the rules?”

I turned you into ketchup ages ago
“How can you turn me into ketchup? Impossible. You forget that I don’t have a physical form to turn into ketchup.”

His bats seem disappointed that there is no ketchup.

"Where's this physical form you gave me? Oh! It never existed? Pity. If you think I'm so weak that I'll bow to your whims, I'm sorry to disappoint you. Also, how do those bones feel?"

In other words, he turns into what he was originally... a non-physical form.

Since Undertale is considered real here (one of the combatants is Sans), souls are not considered attached to the body. Therefore, HTP does not die or remain attached to the ketchup when his physical body is destroyed.

LOL! Hard ketchup! He doesn't have a body... you destroyed it. That is what you wanted, right?

“I don’t think you understand. Even if you COULD create a physical form that could contain me AND had the ability to shove me inside it, I wouldn’t even fit. Haha.”

Since Undertale is considered real here (one of the combatants is Sans), souls are not considered attached to the body. Therefore, HTP does not die or remain attached to the ketchup when his physical body is destroyed.
Thank you, Werewolf.

I return, and ROUNDHOUSE KICK WEREWOLF RY STYLE, oops there goes our mod . And then I turn togepi into freshly squeezed ketchup and serve it to htp's "soul". The ketchup has anti-paranormal poison and destroys htp's non-physical form.

2. HTP, well then I put you in Godzilla and turn you into ketchup then...
“You don’t understand. It’s not a matter of physical size. I, unlike those stones you have, am actually infinite.”

“Thanos suddenly found that he was dead, his particles spread out across the multiverse.”
”Restart.”
”But then Thanos was alive again, thanks to the mercy of the Narrator. Hopefully, he knows his place now.”

I return, and ROUNDHOUSE KICK WEREWOLF RY STYLE, oops there goes our mod . And then I turn togepi into freshly squeezed ketchup and serve it to htp's "soul". The ketchup has anti-paranormal poison and destroys htp's non-physical form.
“Werewolf said he wasn’t modding. Did you miss the paragraph?”
“You guys are doing all these things to me, but first you have to FIND me. And since I’m everywhere at once, that’s a little difficult.”
”But it wouldn’t work anyway. You see, I’m not paranormal. I’m just as real as you are. Technically, even more so.”
"As for you, Bill..."
Sans throws you up against a tree and pierces you with five bones, dealing insane KR for all the killing you've done.
"Put some EFFORT into it."
You mean "BACKBONE," do you not?