Generally, I favor third-person limited in the context of RP. In regards to first-person, I’m not writing the singular viewpoint character but rather one among many, and while I like good usage of first-person every now and them, in my opinion it either centers the narrative around whatever character is using ‘I’ or can otherwise potentially become confusing if everyone is using ‘I’ at once. In regards to second-person, it’s something that I’ll use verbally in tabletop DMing from time to time but I’m wary of it—I want to make clear the distinction between a character and a player because when those wires cross it can often spell disaster.

Writing on RPGuild, I favor past tense because it’s more common and because RP is more commonly received after the fact; in an environment like MMO RP, with the ephemeral and snappy nature of MMO chat, I tend to write with present tense both because it’s common there and because I think it suits how you receive the writing a little better. One thing that I think encourages present tense in MMO RP is a healthy aversion to godmodding—if you don’t want to step on too many toes, you’ll be using the subjunctive especially in combat situations, and I think that encourages the present tense because “would hit” is generally less wordy than “would have hit.” I don’t dislike present tense as many seem to and I find the distaste for it to be curious; it can be a crutch at times, as it is in a lot of YA fiction, but I like the quality of immediacy it has as well as the way it becomes more akin to how most people recount stories orally (i.e. “So I’m talking to this guy and....”) which can be good and bad.

It’s a little tangentially-related but I’ll mention interiority as well: that changes for me depending on what I’m writing, though from what I’ve seen on RPG most tend to include it even in collabs which can be somewhat omniescent in feel in an interesting way that seems a little peculiar to RP. It’s not omniscient but rather limited and shifting.