Roblox: Create a creature and i might add it to my paranoid horror game (dont get mad at me if i change things)

https://gamejolt.com/p/give-me-creature-ideas-for-my-paranoid-horror-game-ywgr9jke

I forgot to put the rules so you might want to redo your remix

are we allowed to make our own creature that your oc is immortal? (I'm adding studster in he's immortal and also asking a question)