Died at 80% my first try. Resisted blind and didn't have nearly enough evasion gear. Came back with more magic accuracy gear to land Kurayami and...
NIN/RDM. Two vile elixirs were used, but honestly they weren't needed. Had enough Perseikos and Kitron juices to keep HP and MP at a comfortable place. I bought 2 bat earrings that I didn't need to use. I was planning to activate them If I started resisting Kurayami too much (and then eye drop right after because heck that acc down on blind potions), but Chat staff accuracy is very nice.
I think you should be able to do it NP Seij, just make sure you have enough accuracy to land blind reliably.
Next up: Dynamis Valkurm Mega Boss.
List of things that could be interesting to attempt as NIN or THF:
THF Faust solo
I realize that the meds required to pull some of these off would extend way beyond what one is capable of holding on their person at one time. Would it still be considered a solo to have an alt nearby with meds/drinks bazaar'd?
EDIT: Special shout out to Koopa, Exelyon, and Alleah for letting me take claim from you to try this solo. Hard to find it up unclaimed these days.