You say 'Él es increible'.
How to say "awesome" in spanish is imponente hope that helped!
impresionante
you' re not awesome = no estás impresionante
"Soy genial."
non alien
que son impresionantes
el suspono colea
(Tu) eres fantastico/a
Translation: amigo magnífico
Impresionante. But if you say awesomo, they'll know what you mean.
soy increible
Baseball es fantastico or you can also say Baseball es fenomenal