Kevin est un ami génial.
It's the same in French.
'chouette' or 'super'
Soyez cool
c'est cool
Mon ami/e est tres cool.Amie=feminine Ami=masculine
ami / amie is friend in French
Tu es cool.
That last answer is the formal way to say 'friend'. male friend - un ami female friend - une amie OR to say "The Friend" you can say- l'ami
you say goodbye in French
je suis cool !
Hyper-cool
"Will you be my friend?" in French is Serais-tu mon ami?.