I'm not sure who exactly Ariel Kenney is as the name isn't widely known without more context. There could be many people named Ariel Kenney. Maybe it's an ordinary person with a personal story known only to a small group, like a local community hero or someone with a unique family story.
First off, examine the setting. How does it influence the story and the characters? Then, think about the pacing. Is it too fast or too slow? And don't forget to look at the author's use of literary devices like metaphors and symbolism.
One possible fanfic could involve Harry and Tom having a power struggle for the title of Lord of Death. Maybe they start off as rivals but gradually come to understand each other's motives and pasts. It could explore how their different magical upbringings influence their relationship with death and the power associated with it.
I'm not sure who 'Kenney Presley' specifically is. There may be many people with this name. Without more context, it's difficult to tell his life story.
In a fanfiction centered around this, it could explore how Harry, as the Master of Death, has a deeper connection to the magical world's balance. Tom Riddle, on the other hand, might be obsessed with obtaining this power from Harry. The story could unfold as a battle of wills and magic, with Harry trying to protect the power while also saving those under Tom's influence.
A really interesting take in a fanfiction could be that the Master of Death power in Harry gives him a new form of magic that is completely incomprehensible to Tom Riddle. Harry could use this to his advantage in their battles, always staying one step ahead. The story could also explore how this new power affects Harry's relationships with his friends, as they might be both in awe and a bit scared of his new abilities.
If Kenney Presley is an average person, the key events in his life might include graduating from school, which could be a significant milestone in his educational journey. Then, perhaps starting his first job and learning the ropes in his chosen profession. Another possible key event could be the birth of his children, if he has any, which would be a major life - changing experience.