Empathy was the ability to sense the emotions of others. Although not everyone had empathy, this wasn't always a super power, but it could be, depending on the level of empathy that was present within the person with this ability.
This ability could allow people to clearly feel what another person feels. Some people with this ability could project emotions into other people. Some, like Rima and Vixen for example, were able to communicate with animals thanks to this ability.