SpongeBob is positive and has a great additute. He's happy, even when he gets low pay. He's a amazing friend to Patrick (for example, how he got him a giant chocolate balloon one Valentine's Day)
He's a good owner for Gary and is genuninely regretful when his neglectfulness lead to Gary's leaving.
You cannot desert all your childhood memories. It's important to look back and remember how happy you were back then. And loosen up sometimes. Only act serious when it's necessary.