Beastmaster immediately comes to mind as a good job for Humes - you'll need to be well rounded when you're on your own, and a nice blend of HP, Str, Vit, and Chr, as well as survivable MP with a Whm sub make Humes ideal for the job. Beastmasters live by their Chr when they charm mobs, and Humes are one of the best in this regard.

Humes also make good Paladins, because they have decent HP, Vit, and MP. You'll have the MP for ample self curing, and the Vitality to outlast a Taru.

Any race can be a Bard, and Humes aren't completely lacking in /whm MP for what it matters. Not that parties are inviting you to backup heal, but you'll have the MP to use a post battle Curaga now and then. Hume Chr is one of the best.

Humes have the strength and accuracy to make Samurai work. Samurai isn't about putting out the numbers like a Dark Knight or Ranger (though numbers help a lot). It's more of a melee support job. A Samurai is only as good as the player is at optimizing the jobs available in a party to put together multiple effective skill chains. Humes can gain TP with the best of them.