Hello, Id like to submit a Parappa the Rapper 2 category extensions, but I wouldn't know where to submit it through. I would assume through the "submit a game" tab, but I'm not sure if that's what im supposed to do, and I just want to make sure.

Game Requests > Single Game > Name your game: "Game Category Extension" > Give proper feedback and motivation as to why we should accept your request, along with a run (or multiple) from what will be on the extension board.

Hello, I want to submit a game that's coming this year and that's outlast 3.

If the game is not out yet, they're probably not going to accept it until it is.

I doubt asking in a 2 year old thread about Parappa the Rapper 2 is going to get your request noticed, so you'd do best to send in this request here: https://www.speedrun.com/knowledgebase/supporthub

The Outlast series has series moderators. I'm quite sure it's their responsibility to add game to the series, no?