Few know the depths of Arthas's mind. Or rather, minds. While Arthas does not think in three separate trains of thought, there is a constant dissociation from anything regarding a personal identity. They typically aren't focused enough to think too hard about it. Their mind is something beyond known psychology.

Outwardly, they seem to have two natural modes. One is a manic, hyperfixated scientist; throwing themself into the tools at their disposal to practice their trade with a mad grin on their face. The other is a cynical, sarcastic necromancer who would really rather sew up a corpse or raise a skeleton than literally whatever you asked f them.

In either state of mind, they're reckless to the point of stupidity when it comes to their own well-being. Fair enough, as they've had their head lopped clean off before. All they did was grumble and stumble after it before going back to their place in a huff to sew it back on while the attacker looked on in utter shock.

Then there's the unnatural mode. Triggered by either a specific word or tone of voice, or suddenly being enclosed or trapped--socially or physically--they freeze up and refuse to speak. A result of the traumatic conditioning and magical suppression forced on them from some time in his past. They don't always seem aware of their surroundings like this, and if they are? Well, wise to stay out of their way.

Funeral of the Dead Butterflies

On a seeming whim, Arthas's entire body can peel away into a thousand large white butterflies. While it could be used for a fast get-away, Arthas appears to prefer using it for... dramatic flair, usually. On occasion, though, the butterflies can be seen simply resting about the city he occupies.

Dream State

Held together by the Shade itself, Arthas is effectively immortal. Any wounds are just flesh wounds to them. They still have to stitch themself back together, and their body typically heals at a slightly faster than normal rate... typically. The true extent of their healing is unknown. Especially considering...

E Y E S

Arthas's innards... don't make sense. The most of their 'infection' is in their core, collarbone to pelvis. Like a vial filled with tar... and intense white eyes. It seems to be able to shift and show itself on any part of their body. And their body can shift as if made of clay to the whims of their mind. They're fond of eyes and teeth.

Necromancy

Oddly enough, the craft Arthas seems to pride themself in is the one they are... fairly average in. They can raise the dead and cast necrotic spells as powerful as any necromancer, but nothing spectacular. And for some reason, it's these skills they chose to use in battle, rather than the horror so clearly concentrated in their body.

Write about their background/story here. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse sit amet massa blandit, fermentum enim a, scelerisque velit. Integer interdum urna ac dui sollicitudin sollicitudin. In feugiat posuere nulla, eget lobortis ante.

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Arthas doesn't need to eat, and honestly really shouldn't, but enjoys it nonetheless.

Arthas has very low self-esteem, for all his outward mania and excitement. He just refuses to fester on it.

Arthas steals body parts. They're usually from the already dead. Usually.

Arthas doesn't really regard themself as a 'person' in a traditional sense, and often has bouts of loneliness without anyone else like them.

Arthas is wholly, utterly, and entirely TERRIFIED of holy places and people.

Arthas often sings as he works. It's usually gibberish lyrics, whatever it is. Makes him happy, though. In a particularly good mood, he may even take up a corpse or skeleton and animate it to dance with him.