I’ve never actually heard or seen someone honor such a request online or IRL, and it would sound ridiculously stilted if they did. Where is Rumpelstiltskin's coat? Rumpelstiltskin must have left it at the bar. Will someone please text Rumpelstiltskin and let Rumpelstiltskin know?
Best not to worry so much about it, I think.
Out of all the posts I've made on this site, I don't think I've ever used a pronoun to reference another user. I haven't noticed anyone use a pronoun to refer to me. It will probably just never come up, especially in real life.
But yeah, if the rare situation arises, just use the name.
the only recurring reason to use a pronoun for someone on a place like this is usually to talk about the original poster, who is already lovingly abbreviated "OP", shorter than most pronouns