There is. Some fanfictions explore their relationship in a really interesting way. They might start with an encounter between Danny Phantom and Raven that leads to them gradually falling in love. It could involve them teaming up to fight a common enemy and realizing they have a special connection during the process.
Definitely. The fanfiction often plays with the unique powers and personalities of both characters. Danny's ghost - related abilities and his somewhat mischievous yet heroic nature, combined with Raven's dark and mysterious powers and her reserved personality, create a really fascinating dynamic in the love stories. Writers can create all kinds of scenarios where they overcome differences, misunderstandings, and external threats to be together.
Yes, there are quite a few. You can check out fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'danny phantom and raven love' and you'll find a variety of stories with different takes on their relationship.