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I usually stick to my own codex, be it in rpgs or back in the time when I was still writing text RPs in chats.
I must admit that I never understood how someone could act or play as a character that contradicts his own beliefs.
I sure as hell can't.
One time curiosity got the better of me and so, unlike the times I played my role as what could be best described as "chaotic good", I took the evil approach in a game. It was surprisingly well written, but it shook me to the core. That's when I realized that this was not my world.

Not even in a game :)

Well mostly based on the game and what would come after..
If I really into a game I do grab lots of paper and a pen and start charting lol Mostly for MMORPGs since one wrong move can affect my whole account.. then again not that many MMORPGs have multi-choices to began with still charting for items/locations/loot/quests/NPC etc..

If it's a Sandbox game I choose every choice and go through all the routes possible since I can repeat the game as many times as I wish to...
But if I ain't that hooked into the game I choose based on a rational deduction and conclusion on which choice is the most badass lol if there are non then what would make me not regret buying that game...

I just pick the options that Id personally pick if I were in the game, so I tend to play pretty neutrally. Honestly, I just dont have it in me to play an "evil" character, even in a game. It makes it less fun for me, same as playing a perfectly "good" character. I want to feel immersed, so picking "my" options seems the best way to sink in

I tend to go out of my way to make it as chaotic as possible.

It depends - if the game has only one kind of playable character (for example The Witcher, or even non-RPG such as TellTale games) I'll be making decisions for myself. However, if I'm playing a game like Skyrim/Fallout, I'll choose the options that reflect my character build (for example, if I play as a thief/thug, I will pick the options that give the bigger profit without paying attention to moral).

Kind of depends on the mood of the game. In some games I try to choose based on what I feel I most agree with. But there's been times where I've played games where choosing more outlandish choices is more fun.

Depends on if it's a pre-made character or the kind where you roll your own
Something like Fallout/Oblivion or SMT I'll decide what direction I want to go when I first make the character. Either I'll say it's myself or I'll decide I want to act a specific way (pacifist run, certain weapon, certain alignment, etc.)
Whereas something like Deus Ex or Final Fantasy I'd take the character's background and the story's tone into account

Either one that fits the character, or provides the greatest reward. If no personality or backstory is already provided for a character, I suppose I'll usually go with either the 'good' option, or some neutral option. Typically the decisions are only focused short-term rather than long-term, because literally no game actually has long-term consequences that actually make sense if they're even included at all, even those games that promise that your choices matter. If it's a repeatable thing, I'll usually just try to exhaust all the dialogue options, or whatever else there may be.

Most of the time I play RPG with walkthrough, especially if the game has so many missable secrets.
So if there is a choice to make, I'll read the walkthrough first and pick the best option. If there is no consequences, then I'll just pick the most kind / fun option.

So my answer is "the option that gives more rewards or lowers the difficulty."

9 out of 10 times i do how i would have done in that situations, The rest is if i know what will happen/the character i help turns out to be somebody i hate etc.

Depends on the type of rpg we're talking about. In The Elder Scrolls style games I try to complete as much content as possible without resorting to guides while also stealing everything that isn't nailed down so my character is incredibly inconsistent in how they act yet I don't care.
In games like Baldur's Gate I come up with a personality during character creation and pick the choices based on what they would do.
In SMT and more railroady rpgs I pick what I feel represents me the most.

It really depends. Overall, however, I would say the Character I am playing in the game would be the choices I make, oftentimes that so happens to be a reflection of myself. If a game allows choice, depending on the quality of the game, I will often replay the game. The first runthrough is generally with my Shikibara character persona, second will be a real life me persona, and if the game is truly fun, I will do 3rd run with a persona I think really fits the world of the game that I would find fun.

Depends on the game, it's options available, and the mood I am in.

Sometimes I start off as a hero but drift towards the dark; sometimes I start off a villain and get closer to the light. Most times I am pretty 'balanced'.
Sometimes I am myself, sometimes I just make it up as I go for shits and giggles.