Endearing qualities are characteristics of a person that make you care for them or love them more. These qualities may vary based on the person.
Endearing qualities can be physical or emotional. It may refer to the blue eyes that someone has. It can also refer to someone's personality, such as their propensity to be loyal, no matter the situation.
In addition to the fact that endearing qualities may vary based on person, different people believe different qualities are endearing. While one person, for instance, may believe that someone's flirtatious personality is endearing, another person may find that this personality characteristic annoys them.