If two people are sympatico, they understand each other and like each other.
Being sympatico with someone is a good thing. It means you get along well and understand each other.
Examples:
She and I are sympatico.
We are very sympatico with each other.
The two friends are sympatico.
The cat and the dog are sympatico.
The teacher and the students are sympatico.
The two superheroes are sympatico and fight crime together.