[@Eviledd1984] Hello, you have some wonderful character ideas. :) By far, #2 feels most at home in Wildbow's [i]Worm[/i] universe. But, the others could be adapted to fit.

From what we've seen in the web serial, [i]Worm[/i] is a world of science rather than magic, angels, or demons. People may believe that their powers come from heaven or hell or faeries or what-not, but they are usually seen as delusional. 

[hider=The real source of power]
Massive multidimential beings called Entities, which normally travel in pairs. They are like jellyfish: made up of millions of smaller living parts called Shards, which may have many different kinds of functions: movement, communication, offense, defense. These beings shed shards into inhabited worlds to test their shards and discover new uses for them. The beings feed off conflict, and their shards steer hosts toward conflict. The entities life cycle usually results in complete destruction of its host planet.
A person who has been given a shard may wield its power after a trigger event. Trigger events are usually very traumatic. The type of trauma can influence the kind of power a person gets. Also, certain shards require certain types of trauma to trigger.
[/hider]

#1 could have a shard that combats aging or causes regeneration. They could also have a power that allows them to alter the characteristics of weapons (fire sword, ice sword, etc). Perhaps they have a delusion that they are immortal or one of Arthur's knights. But instead of fighting demons, he targets Endbringers and Case 53s (mutated people).
#2 would fit right in.
#3 could be Shaker/Changer/Thinker who alters their surroundings and appearance  based on fears to scare people.

The world of Worm can be a bit limiting, but that's art of the fun. I'm sure you'll figure something out. And we're here to help. :) Plus, there's plenty of wiki sources.