Conversation so far:
who is oscar the grouch's best friend
For several seasons, Oscar the Grouch was frequently shown with his friend and pet Slimey, an orange worm.
Does Oscar the Grouch have any other friends besides Slimey?
The only person Oscar the Grouch has ever liked on-camera was Maria, which he would never admit.

Question: What's the character's personality like?
Self-contained rewrite: What's Oscar the Grouch's personality like?