Practicality tipsI have an alternative universe where I RP my character as one of two Warriors of Light, along with my levelling partner. Usually, to be honest, we do the dungeon itself OOC - there's a time limit on how long you can spend in the instance (90 minutes), during which you have to both complete the instance and whatever roleplay you wanted to do. If you don't do it fast enough, the game kicks you out, and you don't get quest credit.

And... to be sadly honest... dungeon combat itself isn't very immersive. You have to stop typing all the time to hit things, or else you become overwhelmed by the real-time game mechanics and die. Especially if one of the people roleplaying is tanking or healing. And then the combat is over, and you can't roleplay your character as having done anything extra-cool or true to themselves in it.

What we usually did was we would complete the dungeon, watching all the cinematics as we went (there's usually 1 at the very beginning and 1 just before the final boss), then afterwards - once we were done and out - talk about how our characters had acted and what sort of state they would be in after what just happened. Then we'd decide which scenes from the dungeon were most interesting to RP, and do them in text format.

The most important (and potentially problematic) part there is the watch all the cinematics part. Most pick-up groups found via the Duty Finder will expect people to skip the cinematics, and although it's impossible for them to run ahead of someone watching the cinematic at the start of the dungeon, they could still drop the group - and the last thing you want is to be locked out of the last boss room because they ran ahead of you there.

But if you're RPing it, then you don't want to skip the cinematics, either - the one time I did skip a cinematic because I felt it was taking too long, it turned out to feature my favourite character and a major plot twist... so you might want to find a light party's worth of RPers to go in with just so you know the group won't charge ahead of you while you watch them.

ExampleSo - to avoid spoilers, gonna make up a dungeon - let's say you go to follow the Evil River. Your character used to live by a river, so you know this dungeon is going to be interesting to them. You run the dungeon OOC, but you pay attention to the enemies' behaviour, screenshotting things you think might be interesting or that your character might react notably to, and you record NPC dialogue in the Event tab of your chat log.

Once you've completed the dungeon, you tell your RP partner that you think it would be really interesting to roleplay the part where Big Monster unexpectedly leapt out of the water when they thought they were safe; so you explain how your character would have reacted, your partner writes some dialogue of how their character would react to that, and you go on with the scene like so. Once you've done this for all the parts of the dungeon you think might have been interesting (which - trust me - will usually take longer than 90 minutes...), then you go to roleplaying your characters after they get out of the dungeon.

Cautionary notes / minor spoilersOne more thing to bear in mind - I'm assuming you're new to the game, and that this is your first play-through of the main scenario quests, so if that's not the case then feel free to disregard this. Especially the later dungeons, most of the plot that gets you there or even the fact you survive at all is indicative of your player-character's status as the world's Chosen One. This is why the RP I do with my levelling partner is set in an alternative universe; I'm not comfortable RPing my character in public as The One Singular Chosen Hero when it's just as important for anyone else in the room to have fun and feel their character is important as it is for me.

You'll definitely see what I mean once you get further into the plot yourself, so I won't explain too much; but I would advise caution about going into the Quicksand and saying "ah yes, I've just conquered [mid-to-high-level dungeon]" until you have seen enough of the plotline to know whether that's something that an average adventurer would actually have a hope of accomplishing.

Lastly, pay attention to the NPCs and their dialogue immediately outside the dungeons. That's an interesting sub-plot in and of itself that demonstrates the power level of the "average" adventurer next to The Warrior Of Light, even at low levels, quite well.