Final answer:
Androgens are the class of drugs used to increase 'maleness' characteristics in hypogonadism.
Step-by-step explanation:
The class of drugs used to increase 'maleness' characteristics in hypogonadism is Androgens. Androgens are sex hormones that promote masculinity and are produced in small amounts by the adrenal cortex in both males and females. They do not affect sexual characteristics and may supplement sex hormones released from the gonads. In hypogonadism, where there is a deficiency of androgens, administration of exogenous androgens can help increase the 'maleness' characteristics.