I rather rdm be a hybrid melee and caster dps with ws that increase the effectiveness of their next spell cast with unique arry of support spells mixed in to help the party. As for dk stick to the classic theme uses hp to deal high damage then drain back up hp. Soul eater on toggle and drain deals damage and heals depending on the difference of max hp and current hp up to a cap. Next tank should be nin though shadows should work like a block that effects spells as well.