Once there was a boy and a girl. They met at a comic book store. They quickly fell in love and often shared their favorite comics. But one day, the boy had to move far away for his family. The girl was heartbroken. She would look at the comics they once shared and cry. Their love, which started so happily among the comics, ended sadly with distance.
To help a sad person in a comic, you might have a friendly character approach them and have a heart-to-heart conversation. Maybe show them that they're not alone and that there's hope. Or have a magical element that brings a smile to their face and changes their outlook.
The ice cream comic strip could be sad because it represents a lost opportunity to have a happy moment with ice cream. Or maybe it's a metaphor for something else going wrong in the character's life.