The Cancer is quite diplomatic. As long as it doesn't injure anyone, they want to get along well with everyone.
As they are not directly hurting anyone's feelings, they don't believe in taking sides and are glad to be diplomatic. Cancers are able to resolve any conflict simply by using diplomacy.
Aries people are also strong diplomats. Perhaps he or she is acting in a diplomatic manner or is being openly at their worst.
Nothing exists in the middle. Finding out whether Aries likes you or not could be a little difficult.
Individuals born under this sign are also included in the list. Despite their reserved nature, Geminis are capable of diplomacy.
They won't meddle in other people's affairs, but they will play their cards if and when necessary. Although they don't advertise themselves as such, they are quite diplomatic.
A Capricorn makes a strong diplomat. If you believe they will advocate for you when necessary, you may be mistaken because they will merely be hiding behind their diplomatic skills.
Just by standing up for you or anything that is morally or ethically right, they won't be damaging their relationships. No matter how awful a person is, they prefer to be on good terms with everyone and are social birds.