The reason could be that they've invested emotions in the cartoons and want the characters' arcs to make sense and be positive. Sometimes, changes in the story or character designs can cause worry if they seem off or not in line with what was originally loved.
Maybe it's because some recent storylines or character developments don't meet their expectations.
Maybe because it's just a minor detail that doesn't really matter much in the big picture of the cartoon.
You can get some cartoon pictures related to worry from Qianku. For example, there are GIFs with the theme of a mess of unhappiness, including design elements such as worry, and cartoon-style hand-drawn pictures of women's kitchen worry. These pictures were designed with different elements to express the emotional state of worry.
He might be worried because he's not sure if he can achieve his goal or because there's some uncertainty in his life. It could also be that he just received bad news.
Maybe she's worried because she lost something important.
Maybe it's facing some challenges or threats that make it worried.
It could be that the girl in the cartoon is worried because she's not sure how to solve a problem or she's afraid of what might happen next. Sometimes, the story creates situations that make her feel this way.
Maybe he's facing a big challenge or problem in the cartoon. That could make him worried.
Maybe they're worried because they lost their favorite toy or didn't do well on a test.
He could be worried because he lost his favorite toy. Or perhaps he's nervous about meeting new people at a party.