How can we Make Ninjas very very Tanky?

[Haeven]

Thank you for the advice! Also, don't get me wrong; I appreciate you tanks and healers. ^^ Yes, I think I should raise my Chocobo to be healer; that's a good idea.

Edit (I'm adding back what I removed): For Ninjas and Dark Knights, if we increase our vitality, we become more tankish or tanky and increase the value of Shadeshift and some other abilities.

Edit: Hi Brandr, how do I unlock these area-specific skills? For example, who do I see?
Edit 2: Ah these are cool instances or bonus areas. I think I'll figure it out. ^^ And yes, I'll rely on my teammates in Dungeons, Trials and Raids.