Assuming you mean "cool" in the sense of "nice" or "interesting".
(Él) es agradable.
(Él) es a todo dar.
(Él) es buena onda.
If you mean "cool" as indicative of temperature.
(Él) tiene frio.
I am cool - soy fresco
soy cool
You can say "Él es muy mono."
yes some people say hes not but in sonics world he is defenetly cool
fresco/a
fresco/a
to tell a guy hes jelous in spanish u say seloso if your going to tell a girl you say selosa.
Sonic the Hedgehog is not that funny, you can say hes cool though.
you say: "puedes calmarte?"
he is not real so u cant say hes funny
Es chido.
If you say try say "he's mine" de better spanish is "el es mio".If you say only "is mine" is correct "es mio"