As for my take on which TMA Fears I'd assign The Lifers, it kind of depends on whether we're picking which fears I think would torment them or which fears I think they'd be avatars of, but if we're going for avatars:
Theoretically, I know Grian should be an avatar of The Eye, because he's literally A Watcher, and the whole decision to ascend at the end of evo could easily be read as the moment he made the choice to become an avatar of The Eye. But also..I just think Grian's like the least watcher aligned evo player in the life series, I think he's actively un-aligned with the watchers, and..I really like Grian as an avatar of The Corruption. Grian has shown a fondness for mycelium, skulk, creepy crawlies (see: snails), all manners of creeping infecting rotting things. Jane Prentiss and Benoît Maçon come to mind, there's an especially common theme, with The Corruption, of preying on people's desire for connection by giving them a love that'll never leave them, even if they have to rot for it, and I think it's easy to slot Grian into that role, considering how poorly he handles being alone, how clingy and (self described as) "needy" he can be, and his way of showing coddling affection for the unsettling things he keeps. I did also briefly consider Grian as an avatar of The Stranger or The Spiral, which I do still think is fitting, but I'm fond of Corruption for him.
Scott, I think, is an avatar of The Web. Now, everyone knows I don't love when Scott is portrayed as manipulative in a way that makes him out to be uniquely malicious or ingenuine in his relationships, and honestly, Scott isn't generally a liar. However. The ability of The Web to think, plan, and strategize, as well as its broad self awareness, are all traits I think are extremely fitting of Scott, and I think the way Scott gets so far in his series is by weaving scenarios with preferable outcomes for himself, and while he rarely lies outright to people, Scott has this way of presenting himself that misleads people and makes them act in ways that are better for him. I mean, the main way Scott gets out of confrontations with Red Names- sometimes mobs of them- that should, by all means, kill him, is through mind games. Acting confident and unphased, like he has no reason to be afraid, laughing and pretending there's no danger to him, bluff charging when he's at low health so people think he's higher than he is. Scott relies on the idea that how much raw skill he has matters much less than how much of a threat he can convince other people he is, meanwhile his real power comes from weaving alliance webs thick enough to catch him no matter what goes wrong. Which is very Web coded, to me.
Scar is also an avatar of The Web. He's a liar, a scammer, a conman. A lot of people view him as unintelligent or unobservant, but I'd argue that, in of itself, is a part of his tactics. Scar plays up his perceived naivety on purpose to get out of doing things he doesn't want to do and to get away with committing slights against people that may otherwise be taken much more harshly. Secret Life comes to mind, where Scar played the poor beaten down dog with no allies, meanwhile he was planting seeds in every alliance and eventually just had his pick of allies on the server. That's how Scar won his season, by slipping under the radar, silently weaving webs, and then tugging on the threads he'd created so everything came falling into place. The fact that he was also trying to pull off smaller scams and bargains throughout the rest of the season (as always) give more fuel to the association between Scar and The Web, but I think it's the more subtle larger plotting Scar's always silently doing in the background (and will deny if you ask, because, why, he's just a sillyguy!) is the more damning bit of evidence for Scar as an avatar of The Web.
Martyn I have to give to The Eye. Not just because of his connection to The Watchers, either I also just think it's awfully fitting of who Martyn is. He's this kind of paranoid and hypervigilant that makes him keep an eye on people, he always wants a clear view of what people are thinking and planning. Martyn is always watching over his shoulder, always aware of what's around him, always trying to get more information because information is power. I also considered other fears for him, considered the web for his deception, and the slaughter for his brutality. But I think his connection to The Watchers, combined with the sense of hypervigilance that plagues Martyn's povs, I think The Eye is the best choice for him.
Ren, I think, has to be The Slaughter, if only because of Third Life. Ren is the one to technically bring war upon the server, he is the one who called 'red winter' down, the red king with blood blinding his vision. And the violence that followed, while technically 'organized' in the sense of being a war, was senseless in many ways. People who could have been (or previously were) allies- Scott and Jimmy who had been so good to Martyn and who had given Ren no reason to distrust them, Cleo and Bdubs who had been two of Ren's oldest friends and allies until he cut them out and put them in his book of names for very little- became targets for the slaughter, and the ways they killed were particularly brutal as well (scott being killed on yellow and then hunted down through the forest and slaughtered again while trying to recollect his stuff comes to mind). Third Life was an outlier in behavior for Ren, I think, but tit took hold of him in such an extreme way I don't think there's any going back from.
Cleo is The Desolation to me. I mean..they're the person known for Burning Everything To The Ground And Then Salting The Earth Behind Them. The Fairy Fort incident comes to mind as the most famous example, but Cleo does this a lot, targeting the things you love most and setting it alight. If you want to lean more into Cleo's zombie imagery I suppose you could also assign them the end (or would stranger be more fitting? would an undead being fit with the end? or it might play into the uncanny valley aspect of the stranger?), but I think the Desolation implications are too strong to go with anything else.
I'm combining Gem and Pearl's segments here solely because I think they're both avatars of The Hunt and some of their evidence is overlapping. I mean, for Pearl I immediately think of Double Life and her wolf army hunting and tearing apart her enemies. For Gem, the Boogeyman Curse from Secret Life comes to mind right away, leading a hunt against the green and yellow names of the server. Murder Camel, Pearl and Gem working together in Simple Life to hunt other players, and Gem getting excited when Pearl gets Boogeyman in Past Life because they get to find and kill someone together are also points of evidence for them being avatars of The Hunt, to me.
Actually, while we're on the subject of The Hunt, I think Joel can be slotted pretty easily into being an Avatar of The Hunt as well. I mean, he's pretty famous for his bloodlust. I suppose a case could be made that his bloodlust would be equally fitting of The Slaughter, but personally, I think Joel's brand of violence has a more primal aspect to it that I find more fitting of The Hunt. Joel leads a lot of the serverwide hunts against yellow/green players (usually targeting scott tbf but not always), and even when it's not his idea, he gets very carried away in the thrill of chasing and killing (side note but a death game like the life series makes a really good source of sustenance for the hunt. i know the watchers are very eye coded. but the hunt, the slaughter, and maybe the web would probably have a field day here.)
BigB is another obvious one to me. He is so associated with The Spiral for me. Especially in later seasons. I mean, he clearly loves striking confusion in people. I can see an argument for The Stranger because of his unsettling energy, or The Web for his disloyalty, but I think BigB's deception falls much more in line with The Spiral's brand of deception than The Web's. Not manipulation in the form of trapping someone in strings, but deception in the form of making people doubt reality and their perceptions of it. Plus, BigB built The Cobblerooms which was a confusing underground maze, and The Spiral is associated with mazes.
..And that's kind of where I run out of immediately obvious ideas for how to categorize the lifers, honestly. Any ideas for the others, chat?