[b]Axel Zech[/b]
Aka The Reaper


[hider=Axel]
[img]https://vignette.wikia.nocookie.net/andreemea/images/9/9d/IMG-20150113-WA0000-1-.jpg/revision/latest?cb=20150202212649[/img]
[/hider]

[hider=Reaper]
[img]https://vignette.wikia.nocookie.net/andreemea/images/c/c1/20150202_213148-1-.jpg/revision/latest?cb=20150202212823[/img]
[/hider]

Axel's abilities come from 2 sources, firstly his own natural abilities:
-While most humanoids (at least from his world) have plates as skin pattern, Axel has more marble like skin, the skin can flip over from the usual white as shown in the image above, to a dark black that makes him nearly invisible in area’s with (nearly) no light, his eyes which glow would be the only thing one can see (which some people tend to think are the hovering eyes of a ghost), if he closes his eyes then people will likely be unable to see him.
-Axel has an enhanced sense of hearing, which he uses when hiding in the darkness with his eyes closed to get an idea of his surroundings.
-He has 3 hearts, one in each chest and one smaller but stronger hiding at the base of his skull, each heart is able to support his body separately but as long as he has all 3 they will work together, the one in his neck will keep his head alive when decapitated but unless there is someone to help him get his head back on his body, he will end up dying from the lack of oxygen in the head (as the head itself has no lungs)
-He has a powerful healing ability, closing big deep wounds in a few hours without any risk of infection and leaving no scars, this healing also prevents him from bleeding out, however if one of the hearts gets “killed” then the body will go into a state of shock and stops healing the wounds, the body will restart naturally in a while body the healing of wounds during this time is slowed down and have a chance to inflict scars, especially the “lethal” wound will leave a scar, a scar will not allow the skin to switch color at that location and even if the skin was black, it will have a coloration that can be seen if someone pays enough attention.
-Related to his origins, there is knowledge imprinted on him which allows him to understand new languages quickly, understand technology and have good instinctual combat skills
-Not much of an ability but when he becomes angry his eyes will turn from blue to red, the more furious the brighter the color will be.

The other source is the weapon he possesses, technically everyone can use these abilities, but the weapon does seem to have some limits on who can wield it and to what extent.
[b]Reapeath[/b]
[hider=Reapeath]
[img]https://vignette.wikia.nocookie.net/andreemea/images/c/c5/20141215_213902-1-.jpg/revision/latest?cb=20150202213056[/img]
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It possesses a lot of abilities, but Axel does not know most of them or for that matter the true extend of the abilities he does know, only time will tell if he discovers other abilities:
-Controlling the user’s gravity (currently only to the degree: extreme acrobatics) 
-Allowing the user to stick to anything 
-Invisibility (target the user or more specific objects like the scythe itself to hide it from view while the user can walk around like normal, it works by absorbing light and even scent of/ around the user) 
-Increased speed (he is fast but not super human)
-The weapon can grow and shrink in size to allow the user to walk around normally without having to hold the weapon all the time, yet still have it with him.
-The chain’s can be controlled by the user, with the bone hands able to grab stuff, Axel however has never really used this feature effectively as he is mostly unaware of it, he subconsciously uses it when turning the weapon small and the chains wrap around his wrist to make it look like a bracelet.

Gear:
-A black cloak (as shown above)
-A sword handle that can extend a energy made long sword.
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Keeping with the OP’s remark about the background and personality I have refrained from giving such information, I however will state one little thing.
It likely will be noticed IC but it may also create some confusion so… Axel has Split Personality Disorder and is completely unaware of this.