My cool character is doing nothing for the plot. How do I deal with him?

So I have this great character( not the main protagonist), who is funny and intelligent. Each scene I write for him is a delight.

But the problem is, he is doing nothing for the plot. I have tried to fit him in a few places, but he always stands out, looking uncomfortable.

I have tried reasoning with him, trying to help him out, but like a bad coin, he always turns up and accomplishes nothing. He's always like "Look at me, I'm so funny, so cute, why do I need to add to the story?"

Now I love this character, but I am stuck on what to do with him. Should I :

a. Kill him?

b. Change him?

c. Anything else??

As I said, the character isn't boring, just not that useful to the story.

Answer

Give him his own story so he's not stealing scenes in someone else's. If he's that awesome, he should be starring in his own book rather than sucking all the oxygen out of this one.