So, you started up Humdrum Hell but don't know what stats you should upgrade for you characters? Well, when play testing the game I did several builds, here's a few of them...

Mondo -  Bump up that Magic, Physical, and Cure. Teach him skills in these areas.
Kevlord -  Go all out on Heat, maybe with some Physical or Logic.
Turdak - Focus on Cure and healing, with some Physical to hit hard when it's time to go on the offense.
Sargatanas - Magic and Logic.

This is the first build I did... but down below is what I think is the most kick-ass!
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Mondo - Jack of all trades again focusing on Magic the most though. Your weapons will boost your physical while you boost magic.
Kevlord - Heat and Logic, focus on learning Fire and Cosmic skills.
Turdak - Cure and Luck. Focus only on healing and use Luck Drop to damage.
Sargatanas - Physical. His weapons will boost his magic up allowing him to do massive damage with both skills.