Xenoblade Chronicles.

I heard that if you manage to get a lot of agility on Dunban and level the right skills/arts he can be a very good tank that requires little healing.

Finally got the game yesterday, right now I'm like 10 hours in, around Lv.19, and on my way to Colony 6 (will return to the camp ASAP though, since the quests there appear to be timed). Loving every single bit of the game so far. The amount of backtracking I'll have to do will be crazy though (with higher level monsters everywhere).

protip: click on the "maps" menu to instantly teleport to any waypoint in the world. I just found that out a couple hours ago, so either I'm slow or they were hiding it LOL. And yeah, Dunban has a skill where if he is low life he has 75% eva or something. I managed to find a decent setup minus Charla, but it took a bit of skillset changing/skill sharing/artes changing to work. Shulk works pretty well as a a secondary tank, secondary healer, and primary DPS, especially against bosses with their friggen talent artes, just needed to share a few of Reyn's skills that prevent tension from going too low to make it work, Shulk goes emo way too fast in battle later on without them. Those skills, coupled with Riki's 23 second long 21 second cooldown super buff that prevents all members from losing tension, has made battling way easier. Not to mention it gives him like 126% increase to a random stat for that time. Riki has decent DPS, great support, and great tanking if you throw on some +agro% gems; Tantrum stacks up agro like mad with those. Still using Melia as a third, though; now that it's closer to max, her heal skill is ok, but what really is nice about it is the very low cooldown...and her elemental auras are irreplaceable.