Since I don't know the exact 'elephant love story', it could be two elephants named something like Mala and Bala. They could be the main characters whose love story is being told.
The main character is surely the friendly elephant. There might also be other animals like birds, monkeys, or deer that interact with the elephant in the story.
Obviously, the main characters are the elephant and the man. There might be other minor characters like other animals or people in the background depending on the context of the story, but the central focus would be on the relationship between this particular man and elephant.
The main character is the elephant. As for its friends, there could be a wide variety. It might include small and nimble animals such as squirrels that can climb trees to get a better view for the group. There could also be strong animals like rhinos that can help protect the group. And then there are likely to be some friendly birds that can fly around and give early warnings of any danger. All these animals together with the elephant could be the main characters in the 'elephant and friends story'.