of course i would like to suggest my own concept first and foremost.
http://forum.square-enix.com/ffxiv/t...st-WIP-and-Art
other than that, i've always thought that a barbarian duel wielding tank has been a long time coming. specifically one that counters enemy attacks with damage or berserker buffs.
blue mage is also cool on paper, but i never really found it all that interesting. mention of it has multiple different cases and i think the most common is a tank that can use magic.
beastmaster as a tank would be a challenge, mostly do to the fact that the devs need to decide on making the summoned beast the aggroed target and risk design flaws as well as lack of beast variety, or have the summoner become the aggroed target and risk design flaws involving risk on the beasts themselves.
a blunt weapon-based tank comes to mind, but then that seems far to similar to WAR, in which they can just give the WAR class blunt-based cosmetics and call it day.
then there's the "holy knight" in which i believe should wield a single one-handed sword. again, a very long time coming to finally get that kind of style instead of just going with PLD or GLD then gaining an "invisible shield" to glamour while still awkwardly having shield-based abilities.
