I really liked the idea of grappling hook and wingsuit, and I am inspired by it.And I have already created the model,texture,animation,script which are required for it by myself.So,my simple question is that can I use it in my game?
Grapling hooks have been used before just cause 3. Think of the legend of zelda series. Wingsuits have been used in ssx, and are quite similar to the delta hanger in far cry.
This is like asking 'can I use cars in my game or will rockstar, the maker of gta, sue me?'. Yes, you can use them. Just make everything yourself. Don't use anyone elses models, textures or code or any other property without their approval.
Ideas are not property.
Fyi: I'm not a lawyer. Technically, anyone can sue you for pretty much anything. Even if you win, going to court is expensive.