The ultimate enemy character is also crucial. Depending on who you make this character be, it can really shape the story. It could be a new ghost with unique powers, or perhaps a corrupted version of an existing character from the Danny Phantom universe.
Sam and Tucker are also great characters to include. They are Danny's best friends and can provide support, comic relief, or get into trouble themselves, adding more layers to the fanfiction.
The most common characters in Danny Phantom Ultimate Enemy fanfiction are Danny, of course. He's the main character so he's always there. Vlad is another one. He has so much potential as an antagonist. Sam and Tucker are also popular as they are Danny's support system. Additionally, some of the more powerful ghost villains like Pariah Dark also make appearances. They add more danger and drama to the stories as they are extremely powerful foes that Danny has to face. Plus, Danny's parents sometimes play important roles as well, especially when their inventions or their knowledge of the ghost world get involved in the plot.
Obviously, Danny himself is a must - include. His friends Tucker and Sam are also very popular characters to add. They can provide support, comic relief, and different perspectives. Vlad Masters is another key character. His complex relationship with Danny and his own half - ghost nature can add a lot of drama to the fanfiction. Then there are the ghosts like Johnny 13 and Kitty, whose unique personalities and powers can create interesting storylines.
Obviously Danny himself is a must - include. But also Sam and Tucker are great characters to have. They've been with Danny through everything and can add some great human - side to the fanfiction. Valerie could also be included. She has her own complex relationship with Danny and the whole ghost - fighting thing. And of course, there are the ghosts like Vlad. His rivalry with Danny can create a lot of interesting storylines.
Danny himself is obviously a must - include character. His friends like Tucker and Sam can also be great additions. They could get involved in the Infinite Realms adventures in some way, like helping Danny from the human side or getting accidentally pulled into the Realms.
Obviously Danny himself is a must - include. Then there's Vlad Plasmius, his archenemy, who could have some devious plans in the Ghost Zone. Sam and Tucker, Danny's human friends, can also be included, maybe they get dragged into the Ghost Zone somehow. And some of the more well - known ghosts like Skulker or Ember could add a lot of action and drama to the fanfiction.
One idea could be exploring what would happen if Danny made a different choice during his encounter with the ultimate enemy. For example, if he tried to reason with his enemy instead of fighting right away.
One interesting plot twist could be that Danny's ultimate enemy turns out to be a future version of himself who was corrupted by too much power. Another might be that the enemy is actually someone he thought was a friend all along, but was secretly plotting against him. And sometimes, the ultimate enemy is an alternate version of Danny from a parallel dimension where he made different choices and became evil.
Obviously Danny himself is a must - include. Then there's Sam and Tucker who could visit the Ghoul School with Danny. Among the ghouls, Spectra is quite popular as she has a very interesting personality. Also, the headmistress of the school can be a great character to write about as she has authority and can create interesting plot points.
Well, aside from Danny, Sam Manson is a very popular character to include. She's not only Danny's friend but also has a bit of a romantic tension with him at times. Tucker Foley is another great addition. His technological know - how adds an interesting element to the stories. And of course, the ghost dog Cujo can be a fun and cute addition. He's small but can be very fierce when needed. Also, Valerie Gray, the ghost hunter, can bring in a whole new dynamic as she's both an ally and sometimes an enemy to Danny.
In Danny Phantom experiment fanfiction, Danny's parents, Jack and Maddie Fenton, are obvious choices. Their knowledge of the supernatural and their inventions could play a big role in the experiment. Then there's Valerie Gray. She could be another test subject in the same experiment as Danny, which would create an interesting dynamic between them. Dash Baxter could also be included in a unique way. Maybe he accidentally stumbles upon the experiment and his reaction to seeing Danny's powers could add some humor. And let's not forget Clockwork. He could be the one who foresaw the experiment going wrong and tries to guide Danny through the chaos.