A likeable, friendly person
Encoding Strategies:
linguistic

sympathetic
caring / understanding
+
-o
adjective suffix
Simpático means nice and is related to the English word sympathetic0, since someone who is nice is sympathetic to your needs.
simpático
nice, likeable, friendly, pleasant
Describes someone who is warm, easy to be around, and naturally well-liked. It's one of the most common ways to compliment a person's personality in Spanish.
Tu amigo es muy simpático, me cayó bienYour friend is really nice, I liked him
Los vecinos nuevos son muy simpáticosThe new neighbors are very friendly