Who was Mrall?

[Skylano]

I've been rereading Words of Radiance and Mrall really stood out to me as someone who isn't what they seem. My first assumption was that he was the kandra that's currently on Roshar, but I feel like he might even be something else or a Soother that just works on himself. The ability to turn off emotions is pretty unique but I feel like it probably has something to do with an important species or interest with him. Maybe he went to the Nightwatcher and asked for the ability to stop his emotions? I know that he's dead from Cultivation's agents as of WaT but I don't think there's been any confirmation of what he is.

[Jult]

I've seen theories in other places about him being a kandra. And it makes sense to me. The fact that he shaves his head and eyebrows is unusual for a Thaylen. But it wouldn't be weird for a kandra since replicating hair is very difficult and tedious for them. There's also a lot of WoBs about kandra being present on Roshar.

Whatever he is, I did think it was an odd choice to offscreen his death.

[the_archduke]

I assumed he was a Sleepless.  Then nothing came of him and he died.   Maybe the offscreen death was a fakeout.