You can sort just the 3 classes or do each subclass. Personally, I think it'd be more interesting to look at each subclass.
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Titans: Hufflepuff. Warlocks: Ravenclaw. Hunters: Gryffindor/Slytherin. Titans are natural protectors. Warlocks are the class that seeks to understand the Light. Hunters are the bravest of the Guardians. Willing to go out into The Wild to face the Darkness and its Minions alone if need be. But they are also the class that seem to be most susceptible to being corrupted.