Think Dark Knight will have any HP-sacrificing abilities, for Solo or Off-tank roles?

[Tanathya]

Erm. Factually, these are the party members who adventure alongside Cecil as a Dark Knight

Then again, he was just a protagonist who had to go alone for most of his dark knight time. He had to survive. A tank that doesn't protect, is not a tank; you can have the most HP, most defense in the entire game from minute 1 and not get hit because the AI doesn't want you to be hit. As easy as that. And for the third time, I just referenced DRK's signature ability, not the fact that it's a tank.