The cultural context can be a factor too. A cologne with ingredients that are native to a particular region might tell a story of that place. For instance, a cologne with oud from the Middle East could tell a story of the rich, exotic culture there. The scent can transport you to that place and give you a sense of its traditions, people, and history.
Tommy in the 'tommy good story' could be anyone. He might be a child with a vivid imagination and a heart full of goodness. Or he could be an adult who has had some remarkable experiences. Maybe he's a local hero in the context of the story, someone who is known for his positive actions.
Well, it could be that Harry is raised in a world where cologne has some sort of magical property. Maybe the scent of a particular cologne is used to protect him or give him special powers. For example, the cologne might be made from rare magical ingredients and whenever Harry wears it, he can blend into the Muggle world more easily because it masks his wizardly aura.
I don't know who Tommy is in this story without more details. He could be anyone - a young man, an old man, a child. Maybe he's a character with a unique personality and a set of experiences.
I don't have enough information to say who they are exactly. They could be ordinary people with an extraordinary story, or they could be well - known in a specific community or area.
One of the main challenges was probably his eating habits. It's hard to break the cycle of overeating when you're used to consuming large amounts of food.
One possible scenario in such a fanfiction could be that Adam has had a really tough day at the studio, facing a lot of criticism. Tommy then steps in to comfort him. Maybe Tommy makes Adam his favorite meal and they just sit and talk about their dreams and how they won't let the negative voices get to them.