Nice, likable, attractive.
she is nice
the teacher is stupid
Tu es un type très sympa means "you're a nice bloke / guy" in French.
It means "you're very nice too" in English.
'C'est sympa!'
You say "likeable" in French as "aimable" or "sympathique."
"tu a le sympa" = "You have the nice one" But I think you made a mistake, just know that "tu es sympa" = "You're nice"
bien, gentil/gentille, sympa
"Thank you! He also is very nice!" is an English equivalent of the French phrase Merci! Il est très sympa aussi! The pronunciation of the phrase in the third person masculine singular of the present indicative -- which also translates as "Thanks! He's really nice as well!" -- will be "mehr-see ee-leh treh seh-pa o-see" in French.
un ami / une amie sympa/sympathique
"Gentille" (feminine) or "Gentil" (masculine) means nice in french "sympa" also means nice in french