First off, I wouldn't worry even a little about 'writing skill'. Skills in anything are things you develop, and you develop them by doing! So it doesn't really matter if it's a waste of time. The important thing with any creative endeavor is that you wanted to do it.

Think about it like this, lots of really popular artists and content creators didn't start off that way. They simply wanted to do something different, and got better as they kept doing it.

The reason I asked the reasoning and desire here, is that goals and intent are a big guiding force, and having different end goals changes what would be positive changes, at least in my opinion.

Since the goal here is to entertain people, there are a couple of reasons why I recommended adding a backstory to your character, and being present tense. First, the game introduces your character as kind of a blank slate; it doesn't matter what you did before, what crimes you committed, or life you led, destiny has set you on this path. In the grand scheme of things, it works, especially if a player doesn't really want to think too hard about roleplaying.

But adding extra depth to a character, like any roleplaying, adds more reasons to be invested. It allows you to flex your narrative skills, completely free of the restraints of the game engine, the game plot, and gives the audience something to be interested in besides the base game's plot.

That's part of what I was attempting to explain earlier; the remaster of Oblivion came out recently, but the original version of the game came out well in the past, in 2006 (geez I feel old!).

Part of the reason I suggested using first person in your writing style is that it gives you opportunities to voice things in more expressive ways. If you're going this route, you'll basically be doing a fan dub of the game. There's plenty out there, where you can effectively re-write the dialogue to be as silly, nonsensical, or meme worthy as possible. Of course, there's plenty opportunity to really try voice acting, and writing a narrative that fits you.

Either way, that's what I meant when using the term 'personality'. Just showing emotion, or if you really wanted to get into character, you could act out scenes as your character itself, and roleplay your playthrough that way. There's really no wrong way of doing this; you won't get much attention on your videos starting out, but that's the same for every creator out there, some close friends included.

The advice I gave for imagery can still be applied in first person too! Instead of recalling torrential rain, you could instead have the character shouting against the wind and rain. This may require some editing skills on your end, though the possibilities are absolutely there. Heck, half of this stuff is why the original Oblivion and Skyrim have such massive modding communities.

Finally, wanted to leave some suggestions. I don't know if this is your first creative thing you've done, or if you've been working on stuff all the time. Either way, the best thing you can do to get better is to keep making stuff, whether that's editing videos, script writing and creating scenes, or whatever you prefer.

If this is your first time, I wouldn't take it too serious, to take the pressure off making them. Doing a fandub like I mentioned earlier is a great way to kill time with friends and add some goofiness into a game you enjoy. Fair warning though, fan dubs are typically better when everyone already knows the game/media before hand, so they can set up funny punchlines, or do skits with a scene they know about beforehand.

That being said, if you do want to do a more serious story, that's perfectly fine too! A serious story can be really fun, and since it's a project you're doing for fun, don't be ashamed to rip character traits from some of your favorite characters!

This is digressing from the point I'm trying to make, but I'm a big fan of TableTop Roleplaying Games (TTRPGS). Think Critical Role, or other games like that. They're really fun, and are great ways to experiment with character ideas or story ideas, although your milage may vary depending on who is at your table.

But in all my experience at these games, video games, and reading, most stories are iterations of one another, just with a different personal flavor. So don't be ashamed to steal an idea you really like, just make sure to put your own spin on it, or reframe it in your own interpretation!