One of the most interesting books I've read in recent years was from second person perspective ("you" instead of I or they). It forced the reader (me) to step into the shoes of a character who was nothing like myself, and it was delightfully uncomfortable to explore.

Anecdote aside, I tend to stick to third person in my RPs because I've heard some partners say that reading posts that use I/me/my throws off their voice for their character, so it just feels safer. Most of the time, I use third person limited, but I'm trying to branch out and dabble in omniscient lately to practice weaving more than one POV together without staggering the flow of my writing. Like the people discussing collabs were saying, it's pretty difficult to do, but I've read some authors who tackle it beautifully, and in my opinion I'll only grow as much as I challenge myself, so I'm hoping to make progress as I work on it.