Another possible theme is transformation. Perhaps in these fanfics, Blue Willow and Angel undergo some sort of transformation, either physically or in their personalities. This could be related to the influence of the Black Cat or other elements within the story world of 'Black Cat by Tisienne'.
I'm not sure specifically which 'Black Cat by Tisienne' fanfics involving Blue Willow and Angel are out there. You could try searching on popular fanfic websites like Archive of Our Own. They have a wide range of fanfics and good search filters that might help you find what you're looking for.
Buffy could be a great addition. Since she is Willow's best friend and has a complex relationship with Angel. Her presence could add some drama and tension, especially if there are unresolved feelings between her and Angel.
I'm not sure specifically as I haven't read this particular fanfic. It could be about a character or situation that is 'blackened' in some way, perhaps a dark turn in the relationship between Willow and the angel in the fan - created story by alrisha.
Social media groups dedicated to fanfiction might also have willow angel fanfic. For example, on Facebook or Reddit, there are groups where fans discuss and share their fan - made stories. You can join these groups and search for the specific type of fanfic you're interested in.
One good willow angel fanfic could be about the willow angel's origin. It might explore how it came to be in the fictional world. Maybe it was once a mortal who was transformed due to some great sacrifice or a powerful spell gone wrong.
A plot could involve Angel protecting Willow from a group of vampire hunters who mistake her for a dark witch. Along the way, they develop a deeper understanding of each other and their respective roles in the fight against evil. They might also discover a long - lost prophecy that involves both of them and has to do with saving the world.
Character interaction. Since it's about Angel meeting Xander and Willow, how they talk, argue, or support each other is crucial. For example, if Angel has a dark secret and Xander accidentally stumbles upon it, how Willow reacts to that situation.
Blue Angel could be a very interesting addition to a Twilight fanfic. If the story focuses on unconditional love, it might show a different kind of relationship than the ones in the original series. Maybe Blue Angel has a special ability related to love that allows them to love unconditionally in a world full of complex relationships like Twilight.
Well, if we consider 'Blue Angel 07' as a new entity in the Twilight fanfic world, 'Love Unconditionally' could be the central theme. It could be about how this Blue Angel 07 character overcomes various obstacles to love someone unconditionally. For example, in the Twilight setting, there are many challenges such as the vampire - human relationship issues. This Blue Angel 07 might have to deal with similar or different challenges while trying to love unconditionally. It could also be that the story is a unique take on the idea of love from a different perspective than what we see in the original books.