[quote=@Dead Cruiser]
[@FrozenEcstasy] I may be understating the gradual nature of the lantern's effect. It's purely a drawback, meant to keep anyone that seeks its shelter from actually getting any rest. The average person will have a "Wow this sucks," reaction to it, and it takes a considerable amount of continuous exposure to have a profound effect. His lack of reaction to it (or perhaps being just so mad he's inundated to it) is meant to emphasize his detachment from humanity.

I'd personally choose the gun over the lantern if made to choose between the two. It represents him as a hunter foremost. Hunter of beasts, hunter of monsters, and if need be hunter of men. I'd say more than going it alone, his personality is better as sort of "live by the sword, die by the sword." Someone mentioned Dark Souls earlier in the thread, and I'm basically up front about my character being much more influenced by Bloodborne.

I'd like to bring up as well, since you sort of mentioned it, his "influence" on the setting. I'd almost intentionally make his influence practically negligible, to represent the futility of his struggle. Despite his fantastic tools and centuries of work, he's still only a single, lonesome man, and the world is no better for his efforts.
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At the end of the day, this still raises an issue of the character having just one too many extremely extraordinary abilities and resources in an RPG where the characters were more expected to be a bit low-key, in the vein of Army of Heroes survivors, wandering pilgrims, People's Legion recruits, etc.  Ageless, with metal organs and presumably more resilience than the average human, plus a hand cannon, plus a powerful lantern that wards off efertide while being compact enough for one person to carry, plus a maddening/agonizing effect to said lantern that the character wielding it is immune to, but that makes it basically impossible to use among allies.

I think, at this point, I'd prefer you cut the lantern entirely and, for the rest of it, I'd like to wait and post the full OOC first, which is much more thorough and clear about the setup of the RPG, along with the sample character, and then see what the first draft of this character's sheet looks like before drawing further judgment.  Keeping in mind, again, that while the concept is interesting, an ageless super soldier is a very out-there and extraordinary set-up, and it'll take a very interesting character with lots of potential for fun and meaningful inter-character interaction for me to give this the okay.