I've seen 'Gentlebeings' in a lot of the setting resources. I think most of the time people will just use singular 'they' or just refer to people by name or title.

Personally I prefer the Culture (Iain M. Banks) use of "Ser" as a generic honorific. This is, I think, particularly useful giving that the post-Fall solar system clearly has been culturally influenced by science fiction writers of the past. As the narrator of Player of Games put it: "Little textual note for you here (bear with me). Those of you unfortunate enough not to be reading or hearing this in Marain may well be using a language without the requisite number or type of personal pronouns, so I'd better explain that bit of the translation. Marain, the Culture's quintessentially wonderful language (so the Culture will tell you), has, as any schoolkid knows, one personal pronoun to cover females, males, in-betweens, neuters, children, drones, Minds, other sentient machines, and every life-form capable of scraping together anything remotely resembling a nervous system and the rudiments of language (or a good excuse for not having either). Naturally, there are ways of specifying a person's sex in Marain, but they're not used in everyday conversation; in the archetypal language-as-moral-weapon-and-proud-of-it, the message is that it's brains that matter, kids; gonads are hardly worth making a distinction over."

I don't think there IS a generic honorific. There are plenty of cultures and languages present, so the honorifics will be just as diverse (and on Titan might not be used at all, since it comes from a very "first-name" culture). The protocol skill probably helps you keep track of all this.

Very true about the protocol skill but i prefer to role play it out rather than roll play :P

If you're in face to face conversation with someone, then I would assume your muse would politely ask their muse what their master likes to be called - such requests via social network sites would be commonplace. Collective pronouns would depend more on the specific speaker and their intended audience.

Considering people can tell their muses to filter out unwanted data, I can imagine some utter narcissists literally won't hear you unless you use their accepted mode of address. Hell, a scenario could be run about an investigation to find a brinkers preferred mode of address just so you can get them to hear you out.

So, basically, the proper mode of address depends entirely on A( the culture or clade you're speaking to, and B( the language you're speaking in. Even in AF 10, there's lots of context, cultural baggage and tone of speaking in how you address people. If possible, AR and Muses can smooth some of this out, but if it's not specific (or your GM didn't expect you to talk to a gang of arms smugglers formerly attached to a Scum Swarm who prior to the fall were part of the Russian Space Navy, but have been sharing bunks with Malaysian and Cambodian refugees for the past ten years, so thus doesn't exactly know how they would go about addressing each-other, to give an example) then you have to rely on your Protocol skill and Knowledge of the Language. There's not a "generic" culture to EP, so there's no generic address. You couldn't even get transhumanity to agree on referring to everyone as "my fellow transhumans". Though this raises the question of just [i]how[/i] good the real-time translation is in EP. If you're hooked up to space Google translate, does it completely translate all of the nuances in context of a word being used to your language, and does it do so literally?