The fox is surely a main character. There could be a hunter as well, who is trying to catch the fox. And perhaps there are other forest - dwelling creatures such as squirrels or deer that play a role in the story, either as bystanders or as part of the fox's environment that influences its actions.
A young fox was exploring the meadow. It came across a beautiful flower. The flower had a very sweet smell. The fox was so attracted to it that it decided to stay near the flower for a while. As it was lying there, a little bird landed on a branch above. The bird started singing a lovely song. The fox listened to the song and felt very peaceful. It thought that the world was full of such wonderful things and that it should explore more. So, it got up and continued its journey through the meadow, with the memory of the flower and the song in its heart.
Definitely the fox. The fox is often depicted as a very sly character in many stories, and in the fox and the wolf short story, it's likely to be the more cunning one, using its wits to get what it wants.
One moral could be that being able to do one thing well is better than claiming to know many things but not being truly proficient at any. The cat could climb the tree quickly when in danger, while the fox hesitated among its many supposed skills and was caught by the hounds.
One moral could be about the power of intelligence over brute strength. The fox uses its wits to deal with the powerful lion, showing that being clever can be more important than being physically strong in certain situations.
The moral is about treating others as you would like to be treated. The fox was rude to the stork by serving food in a way that was easy for him but difficult for the stork. Then, when the stork returned the 'favor' in a way suitable for its long beak, the fox learned a lesson.
Often in such stories, the moral could be related to survival. The clever fox uses its wits to get by, so perhaps the moral is that in a tough world, using your brain can help you survive and thrive. For instance, if the fox outsmarts predators or competitors in the story, it shows that being clever is better than being physically strong sometimes.