Though I don't believe that it is officially covered in the lore, I highly doubt that Bretons live longer lifespans. Here's why: Bretons resulted from an relatively brief period of frequent Aldmer-Mer interbreedings which occurred in High Rock in the late-Merethic Era and continued into the early-First Era (at which point it was under the Direnni Hegemony), which is probably the latest point that pure elves were mixing into their gene pool. The earliest "Bretons" (after only twelve generations of interbreeding, still in the Merethic Era) were described as predominantly elvish, whereas later Bretons (as we see them in modern Tamrielic history) appear completely human only with their own distinctive (French, real-world Breton-inspired) features. After humans starting establishing their own empires and pushing/wiping the elves off of Tamriel, Bretons spent the subsequent thousands of years breeding mostly amongst themselves and with other human races (Nords and Imperial Cyrods), greatly diluting their elvish blood. Apart from their increased aptitude for magic (which is probably accentuated as a gameplay mechanic more than anything), the Bretons are pretty standard humans.
Half-elves, on the other hand, probably have lifespans somewhere between that of an elf and a human (as you were thinking). To determine just how long this might be, we can look to established TES lore. A Q&A in the TESO FAQ lays that 200 years is old for an elf (300 years is very, very old, and anything beyond that is relying on powerful magicks [we see super-ancient Dunmer pushing a thousand years in Morrowind]). Humans typically live 70-80 years (though some [particularly certain Emperors] have lived to over a hundred, probably due to magic). A half-elf could probably live up to 140 years [sans the life-extension magic]).
The short answer: half-elves, yes; Bretons, almost certainly not. Hope this helps and inspires you to write some awesome fan-fiction! :)
Not if you're calling it "European" in-universe. But otherwise, of course. A greatsword with a design like that would probably be rather popular in the Breton kingdoms of High Rock (considering the medieval Britain parallels). Additionally, the Divine Crusader, Pelinal Whitestrake (and later, the Knights of the Nine, who he inspired), used equipment with these kinds of medieval motifs (although I'm not sure how this would fit into Breton history). Pelinial himself is really interesting because apparently he was an immortal human hero with an ambiguous (and somewhat dark, if you consider his madness and all of the slaughtering he apparently did) past that could have potentially stretched back into Merethic Era prehistory. At some point before his fateful battle with Umaril the Unfeathered, he was gifted his medieval-styled equipment by the Eight Divines (keep in mind that this is all before Talos; and interestingly, he probably wasn't a Shezarrine either [if Kirkbride left him out on purpose]. For the gaping cavity in his chest, it can be speculated that he may be Shor/Sheogorath/Arden-Sul himself.). Think of him as the official warrior-Jesus of the Eight.
Sounds fun. That will be integrated into Undeath, if we ever start that up. I want to get Singularity up and running first, then I'm all for commencing it. I could also work out weapon statistics, etc. Of course, I'd need your help. Naturally, considering how much you want to see this happen, you'll be an administrator/gamemaster with me. Cheers, :)
Look up a game called Elite Dangerous. It's extremely awesome. Their hypercorporate themes and rotating space stations are extremely on point. Singularity is a lot like that, only altered (technologically and sociologically) to accommodate transhumanism, and there is no FTL (I do like their concept of FTL a lot though. It keeps things mostly unexplained to avoid stepping on any toes... but the few canon principles of how it works are feasible. Basically, it just facilitates fast intra- and interstellar travel, which is pretty fundamental for any sci-fi game encompassing so many distant settings). Their ships, however, rely pretty heavily on this sort of travel, so nothing like that would work.
Anyways, here on my sandbox wiki I'm working on a new (but inspired) theme, as you can see. I'm thinking I might revitalize TESFanon with it later on, either that or (speaking of "sapience") I might start my own hard science fiction universe worldbuilding project (something similar to Orions Arm, if you've heard of it [if not, I recommend you look it up, its by far my favorite science fiction universe])... If I do either, would you be interested in an administrative position of some sort? :)
Not 870 a mossberg 800 two different things . My zombie ideas are like for a sniper they shoot bone or something and have high calcium and phosphorus deposits for harder bones and to help produce more bones.
You did see them on my list? Thats what the Shooter and Sniper classes will do. Shooters will be built for medium range. They resemble regular Walkers, only maybe with a little more fungal pigmentation on the skin, and they have a hollowed-out hand that fires a calcified fungal flechette, like a needlegun. The Sniper will be similar, but slimmer and taller, and best suited for longer-range shooting with larger, deadlier bullets. Perhaps both arms would be heavily-altered and massed together to form one, big sniper-rifle like appendage. It would compromise their mobility, making them a lot more lumbering which would be good because it would put them at a disadvantage at close range. They would still have a deadly melee though, slamming you with their arm-gun. As for firearms, what website could I use to get a general idea of the weapon and decent stats for it? The Mossberg 800 is not on Wikipedia.