To explain my label for Roles:

DD / Off Tank - 2nd tank alternative for groups that need higher DD and a tank to grab/distract lesser adds, not meant as a replacement to 1 of 2 tanks but some groups could swing it either way. Has access to Damage Limit Break

Tank / DD - Similar to Warrior as it is now.

Suppression Tank / DD - A new main tank type to FFXIV, one that debuffs an enemy heavily rather than has natural mitigation abilities and deals an unusual amount of damage/has access to Damage Limit Break